test: Updated 07-remove-managed-by & added 03-errors for 1-083_validate_apps_in_any_namespace kuttl test

[ciiay]

Signed off: @ciiay
What type of PR is this?
/kind failing-test

What does this PR do / why we need it:
For GITOPS-2874 which is a blocker to our test-automation.

Which issue(s) this PR fixes:

Fixes #?
Flaky test 1-083_validate_apps_in_any_namespace

How to test changes / Special notes to the reviewer:
The main change of this PR is I updated the way to remove managed-by label with the declarative YAML approach which often results in more immediate reconciliation. In this way, we don't have to restart the application-controller anymore.

This PR works along with argocd-operator PR #934.

[openshift-ci]

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[openshift-ci]

@ciiay: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/v4.12-kuttl-parallel	570a16c	link	true	/test v4.12-kuttl-parallel
ci/prow/v4.10-kuttl-sequential	570a16c	link	true	/test v4.10-kuttl-sequential
ci/prow/v4.11-kuttl-sequential	570a16c	link	true	/test v4.11-kuttl-sequential

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[ciiay]

This PR was created to fix flaky kuttl tests which block ci check of argocd-operator PR #934. Now that the original argocd-operator PR #934 has been closed, closing this PR as well.