change BoardService in favor of boardsStore on board blank state of the component board

What does this MR do?

This MR removes the use of BoardService in favor of boardsStore logic on board blank state of the component board.

Address: https://gitlab.com/gitlab-org/gitlab-ce/issues/61621

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• [-] Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• [-] Style guides
• [-] Database guides
• [-] Separation of EE specific content

Performance and testing

It will not require changes on testing because it should have been addressed in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/29204

If cross-browser testing is not required, please remove the relevant item, or mark it as not needed: [-] -->

• [-] Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers

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