Allow the listing of already included patches when importing them into a custom channel

[wweellddeerr]

What does this PR change?

When a patch exists in multiple origin channels, SUMA currently doesn’t allow importing from more than one channel. This PR adds a checkbox that allows the user to list the already included patches so that it is possible to import the related packages in case the patch was originally imported from a different channel.

GUI diff

• [x] DONE

Documentation

• No documentation needed

• [x] DONE

Test coverage

ℹ️ If a major new functionality is added, it is strongly recommended that tests for the new functionality are added to the Cucumber test suite

• 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/25002

• [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

If you don't need a changelog check, please mark this checkbox:

• [ ] No changelog needed

If you uncheck the checkbox after the PR is created, you will need to re-run changelog_test (see below)

Re-run a test

If you need to re-run a test, please mark the related checkbox, it will be unchecked automatically once it has re-run:

• [ ] 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"

Before you merge

Check How to branch and merge properly!