Configure AppStreams via Activation Keys

[wweellddeerr]

What does this PR change?

Add a new tab in activation key details page to pick AppStreams and enable the selected AppStreams on systems bootstrap.

GUI diff

Before:

After:

• [x] DONE

Documentation

• No documentation needed: add explanation. This can't be used if there is a GUI diff

• No documentation needed: only internal and user invisible changes

• Documentation issue was created: Link for SUSE Manager contributors, Link for community contributors.

• API documentation added: please review the Wiki page Writing Documentation for the API if you have any changes to API documentation.

• (OPTIONAL) Documentation PR

• [x] DONE

Test coverage

• No tests: add explanation

• No tests: already covered

• Unit tests were added

• Cucumber tests were added

• [x] DONE

Links

Issue(s): https://github.com/SUSE/spacewalk/issues/24198

• [x] DONE

Changelogs

Make sure the changelogs entries you are adding are compliant with https://github.com/uyuni-project/uyuni/wiki/Contributing#changelogs and https://github.com/uyuni-project/uyuni/wiki/Contributing#uyuni-projectuyuni-repository

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• [ ] No changelog needed

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Re-run a test

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• [ ] Re-run test "changelog_test"
• [ ] Re-run test "backend_unittests_pgsql"
• [ ] Re-run test "java_pgsql_tests"
• [ ] Re-run test "schema_migration_test_pgsql"
• [ ] Re-run test "susemanager_unittests"
• [ ] Re-run test "javascript_lint"
• [ ] Re-run test "spacecmd_unittests"

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