[release-1.9] Function CopySecretWithName for creating secrets with specific name

[mgencur]

This is a manual cherry-pick of #7002

Proposed Changes

Pre-review Checklist

• At least 80% unit test coverage
• E2E tests for any new behavior
• Docs PR for any user-facing impact
• Spec PR for any new API feature
• Conformance test for any change to the spec

Release Note

Docs

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mgencur
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[mgencur]

/cc @creydr
Please review this as well.

[knative-prow]

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

Test name	Commit	Details	Required	Rerun command
build-tests_eventing_release-1.9	32a28e5	link	true	/test build-tests

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[mgencur]

This PR is not required.