[TEST] Allow more warnings about multiple template matches

Adds some extra allowed warnings about multiple index templates
matching on index creation of the same type that were added
in elastic#56038.

Author: droberts195

x-pack/qa/rolling-upgrade/src/test/resources/rest-api-spec/test/upgraded_cluster/110_geo_shape.yml

@@ -1,6 +1,10 @@
 ---
 "Test upgraded > 7.7 cluster with pre-7.8 and 7.8+ geo_shape fields":
+  - skip:
+      features: allowed_warnings
   - do:
+      allowed_warnings:
+         - "index [new_locations] matches multiple v1 templates [global, template], v2 index templates will only match a single index template"
       indices.create:
         index: new_locations
         body:

x-pack/qa/rolling-upgrade/src/test/resources/rest-api-spec/test/upgraded_cluster/40_ml_datafeed_crud.yml

@@ -8,7 +8,11 @@ setup:
 
 ---
 "Test old and mixed cluster datafeeds without aggs":
+  - skip:
+      features: allowed_warnings
   - do:
+      allowed_warnings:
+         - "index [airline-data] matches multiple v1 templates [global, template], v2 index templates will only match a single index template"
       indices.create:
         index: airline-data
         body:
@@ -108,6 +112,8 @@ setup:
   - skip:
       features: allowed_warnings
   - do:
+      allowed_warnings:
+         - "index [airline-data] matches multiple v1 templates [global, template], v2 index templates will only match a single index template"
       indices.create:
         index: airline-data
         body: