chore(similarity): Add killswitches for each feature flag (#74274)

Add killswitches for each feature flag since these are now managed in
feature handlers in getsentry
We will check the killswitch in the feature handler so we can turn off
the feature faster

Author: jangjodi

src/sentry/options/defaults.py

@@ -824,6 +824,30 @@
     type=Bool,
     flags=FLAG_MODIFIABLE_BOOL | FLAG_AUTOMATOR_MODIFIABLE,
 )
+register(
+    "seer.similarity-embeddings-killswitch.enabled",
+    default=False,
+    type=Bool,
+    flags=FLAG_MODIFIABLE_BOOL | FLAG_AUTOMATOR_MODIFIABLE,
+)
+register(
+    "seer.similarity-embeddings-grouping-killswitch.enabled",
+    default=False,
+    type=Bool,
+    flags=FLAG_MODIFIABLE_BOOL | FLAG_AUTOMATOR_MODIFIABLE,
+)
+register(
+    "seer.similarity-embeddings-metadata-killswitch.enabled",
+    default=False,
+    type=Bool,
+    flags=FLAG_MODIFIABLE_BOOL | FLAG_AUTOMATOR_MODIFIABLE,
+)
+register(
+    "seer.similarity-embeddings-delete-by-hash-killswitch.enabled",
+    default=False,
+    type=Bool,
+    flags=FLAG_MODIFIABLE_BOOL | FLAG_AUTOMATOR_MODIFIABLE,
+)
 register(
     "seer.severity-killswitch.enabled",
     default=False,