Create new selection_summary component for GraphQL

What does this MR do?

Create new selection_summary component for GraphQL

• creates copy of old selection_summary that relies on Vuex and makes it rely on GraphQL instead
• in the future the new selection_summary will replace the old one everywhere
• add tests for new selection_summary component

Screenshots

New Component being used (though not in this MR) selection_summary_-_new

Also this demo on youtube

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

Relates to #213598 (closed) Depends on !29150 (merged)