Update dropdowns in issue templates to have no option selected by def…

…ault (opensearch-project#11805)

This change updates the bug and feature templates to set the first option as empty.
This prevents form submission until an option is selected.

Signed-off-by: Marc Handalian <marc.handalian@gmail.com>

.github/ISSUE_TEMPLATE/bug_template.yml

@@ -15,7 +15,7 @@ body:
       description: Choose a specific OpenSearch component your bug belongs to.  If you are unsure which to select or if the component is not present, select "Other".
       multiple: false
       options:
-        - Other
+        - # Empty first option to force selection
         - Build
         - Clients
         - Cluster Manager
@@ -24,6 +24,7 @@ body:
         - Indexing:Replication
         - Indexing
         - Libraries
+        - Other
         - Plugins
         - Search:Aggregations
         - Search:Performance

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -22,7 +22,7 @@ body:
       description: Choose a specific OpenSearch component your feature request belongs to.  If you are unsure of which component to select or if the component is not present, select "Other".
       multiple: false
       options:
-        - Other
+        - # Empty first option to force selection
         - Build
         - Clients
         - Cluster Manager
@@ -31,6 +31,7 @@ body:
         - Indexing:Replication
         - Indexing
         - Libraries
+        - Other
         - Plugins
         - Search:Aggregations
         - Search:Performance