UpdateAvailable notification parsing fix

[cbosdo]

What does this PR change?

After the Java 17 update the Gson introspection raises an error when parsing the runtime field. Since this field is only for testing, mark it as transient to skip it during serialization and deserialization.

GUI diff

No difference.

• [X] DONE

Documentation

• No documentation needed: only internal and user invisible changes

• [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: For some reason the unit test I could come up with didn't trigger the error, only a real environment did.

• [X] DONE

Links

Issue(s): https://github.com/SUSE/spacewalk/issues/24905 Port(s): https://github.com/SUSE/spacewalk/pull/25471

• [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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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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