Add GlFilteredSearch to Group EDIT Boards [RUN ALL RSPEC] [RUN AS-IF-FOSS]

What does this MR do?

Repro:

• rails c
• Feature.enable(:boards_filtered_search)
• Navigate to group > issue boards

This is the first iteration to add GlFilteredSearch to Issue boards. Currently, this is only going to group boards because there is a dependency on !51423 (closed) for project boards.

What this MR includes

• Basic text search functionality for group issue boards

What this MR does not include

• Tokenized search (will be handled in next MR)
• Recent searches

Epic

Resolves #322948 (closed)

Screenshots (strongly suggested)

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team