Implement EntityKindPicker allowing to filter on multiple kinds

[Crevil]

This change implements the EntityKindPicker allowing for selecting multiple kinds.

This is a draft of implementing a more clear kind picker that also support multiple kinds at once.

It is currently breaking any logic based on filter kind which needs to be considered more carefully.

More discussion can be found at https://github.com/backstage/backstage/issues/9616#issuecomment-1205412715

Signed-off-by: Crevil [email protected]

Hey, I just made a Pull Request!

:heavy_check_mark: Checklist

• [ ] A changeset describing the change and affected packages. (more info)
• [ ] Added or updated documentation
• [ ] Tests for new functionality and regression tests for bug fixes
• [x] Screenshots attached (for UI changes)
• [x] All your commits have a Signed-off-by line in the message. (more info)

[github-actions[bot]]

Missing Changesets

The following package(s) are changed by this PR but do not have a changeset:

• @backstage/plugin-catalog-react
• @backstage/plugin-catalog

See CONTRIBUTING.md for more information about how to add changesets.

Changed Packages

Package Name	Package Path	Changeset Bump	Current Version
@backstage/plugin-catalog-react	plugins/catalog-react	none	v1.1.3-next.1
@backstage/plugin-catalog	plugins/catalog	none	v1.5.0-next.1

[github-actions[bot]]

This PR has been automatically marked as stale because it has not had recent activity from the author. It will be closed if no further activity occurs. If you are the author and the PR has been closed, feel free to re-open the PR and continue the contribution!

[Crevil]

Closing this until I have finished it more up 👍