Remove confusing notification message for recurring states

[parlt91]

What does this PR change?

When updating state assignments a 'State assignments have been saved.' message would be shown that could confuse users that their changes are already persistet and clicking the 'Update Schedule' button is not needed.

Remove the above message to avoid this kind of confusion. The message will still be shown if the component is used from the 'Configuration Channels' UI where clicking the 'Confirm' button actually persists the changes in the database.

GUI diff

• DONE

Documentation

• No documentation needed

• DONE

Test coverage

• Cucumber tests were adjusted

• DONE

Links

Issue(s): #

• 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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[github-actions]

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Reference tests:

• https://github.com/uyuni-project/uyuni/actions/workflows/acceptance_tests_secondary_parallel.yml?query=event%3Aschedule

• https://github.com/uyuni-project/uyuni/actions/workflows/acceptance_tests_secondary.yml?query=event%3Aschedule

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