Bug Fix: Update line chart encapsulation (tensorflow#6092)

## Motivation for features / changes
tensorflow#6083 changed the way scss is namespaced. This fixed one issue but
created others

For Googlers:
Before cl/493268254
After cl/493373147

## Technical description of changes
I created a do nothing component that simply disables scss encapsulation
to enable intercomponent styling.

## Screenshots of UI changes
Before:

![image](https://user-images.githubusercontent.com/78179109/206013391-afbda6cb-b05d-467f-b60f-7165c50af74a.png)

After:

![image](https://user-images.githubusercontent.com/78179109/206012972-d04d4b41-1d1b-49b6-95a4-4d8eeeab6018.png)

## Detailed steps to verify changes work correctly (as executed by you)
1) Start tensorboard
2) Navigate to
http://localhost:6006/?enableLinkedTime=true&enableDataTable=true&allowRangeSelection=true&enableProspectiveFob=true#timeseries
3) Hover the X Axis of a scalar card
4) Hover the Y Axis and assert the edit button appears in the top left
corner (not the top right)
5) Assert the axis edit button appears
6) View an image card and assert the axis is NOT gray

## Alternate designs / implementations considered
We could have manually encapsulated all the css classes

Author: rileyajones

tensorboard/webapp/widgets/line_chart_v2/line_chart_component.ng.html

@@ -23,6 +23,7 @@
   #overlayTarget="cdkOverlayOrigin"
   cdkOverlayOrigin
 >
+  <line-chart-unencapsulated></line-chart-unencapsulated>
   <div class="series-view" #seriesView>
     <line-chart-grid-view
       *ngIf="!lineOnly"

tensorboard/webapp/widgets/line_chart_v2/sub_view/BUILD

@@ -22,6 +22,7 @@ tf_ng_module(
         "line_chart_grid_view.ts",
         "line_chart_interactive_utils.ts",
         "line_chart_interactive_view.ts",
+        "line_chart_unencapsulated.ts",
         "sub_view_module.ts",
     ],
     assets = [

tensorboard/webapp/widgets/line_chart_v2/sub_view/line_chart_axis_view.scss

@@ -215,15 +215,3 @@ $_border-style: 1px solid mat.get-color-from-palette(mat.$gray-palette, 500);
     transform-origin: center;
   }
 }
-
-// Why this weird hack?
-// The prospective fob area is absolutely positioned over the XAxis.
-// This prevents hover events from reaching the XAxis.
-// The .extent-edit-button should appear when the XAxis is hovered.
-.line-chart:has(.horizontal-prospective-area:hover) {
-  .x-axis {
-    .extent-edit-button {
-      visibility: visible;
-    }
-  }
-}

tensorboard/webapp/widgets/line_chart_v2/sub_view/line_chart_axis_view.ts

@@ -18,7 +18,6 @@ import {
   EventEmitter,
   Input,
   Output,
-  ViewEncapsulation,
 } from '@angular/core';
 import {Dimension, Formatter, Scale} from '../lib/public_types';
 import {LinearScale, TemporalScale} from '../lib/scale';
@@ -35,9 +34,6 @@ const AXIS_FONT = '11px Roboto, sans-serif';
   templateUrl: 'line_chart_axis_view.ng.html',
   styleUrls: ['line_chart_axis_view.css'],
   changeDetection: ChangeDetectionStrategy.OnPush,
-  // This prevents the CSS generated from being namespaced thus allowing CSS
-  // to reach into the line_chart_component and card_fob_controller_component
-  encapsulation: ViewEncapsulation.None,
 })
 export class LineChartAxisComponent {
   @Input()

tensorboard/webapp/widgets/line_chart_v2/sub_view/line_chart_unencapsulated.ts

@@ -0,0 +1,46 @@
+/* Copyright 2022 The TensorFlow Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+import {
+  ChangeDetectionStrategy,
+  Component,
+  ViewEncapsulation,
+} from '@angular/core';
+
+@Component({
+  selector: 'line-chart-unencapsulated',
+  template: '',
+  styles: [
+    /**
+     * Why this weird hack?
+     * The prospective fob area is absolutely positioned over the XAxis.
+     * This prevents hover events from reaching the XAxis.
+     * The .extent-edit-button should appear when the XAxis is hovered.
+     */
+    `
+      .line-chart:has(.horizontal-prospective-area:hover) {
+        .x-axis {
+          .extent-edit-button {
+            visibility: visible;
+          }
+        }
+      }
+    `,
+  ],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  // This prevents the CSS generated from being namespaced thus allowing CSS
+  // to reach into the line_chart_component and card_fob_controller_component
+  encapsulation: ViewEncapsulation.None,
+})
+export class LineChartUnencapsulated {}

tensorboard/webapp/widgets/line_chart_v2/sub_view/sub_view_module.ts

@@ -22,6 +22,7 @@ import {MatMenuModule} from '@angular/material/menu';
 import {LineChartAxisComponent} from './line_chart_axis_view';
 import {LineChartGridView} from './line_chart_grid_view';
 import {LineChartInteractiveViewComponent} from './line_chart_interactive_view';
+import {LineChartUnencapsulated} from './line_chart_unencapsulated';
 
 /**
  * SubViewModule provides UI elements for a traditional line chart; axes, grid, and
@@ -33,11 +34,13 @@ import {LineChartInteractiveViewComponent} from './line_chart_interactive_view';
     LineChartAxisComponent,
     LineChartInteractiveViewComponent,
     LineChartGridView,
+    LineChartUnencapsulated,
   ],
   exports: [
     LineChartAxisComponent,
     LineChartInteractiveViewComponent,
     LineChartGridView,
+    LineChartUnencapsulated,
   ],
   imports: [
     CommonModule,