Fix GitHub labels in release changelog generator script and PR template

[rm3l]

What type of PR is this:
/area refactoring
/area release-eng

What does this PR do / why we need it:
This fixes the remaining places, after cleaning up all the labels we use in the repo: https://github.com/redhat-developer/odo/labels?sort=name-asc
I wanted to delete the kind/code-refactoring label (superseded by area/refactoring), but it was still being used here.
Also, the kind/tests label had been removed already in the past, but the changelog script was not updated accordingly.

Which issue(s) this PR fixes:
—

PR acceptance criteria:

• Unit test

• Integration test

• Documentation

How to test changes / Special notes to the reviewer:

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[valaparthvi]

On an unrelated note, we need to modify the IBM pipelines to not trigger a run when a change is made to .github and certain scripts.

[valaparthvi]

/override ODO-PODMAN-TEST
/override OpenShift-Integration-tests/OpenShift-Integration-tests
/override windows-integration-test/Windows-test

Overriding the above tests since their failure is not related to the changes in this PR.

[openshift-ci]

@valaparthvi: Overrode contexts on behalf of valaparthvi: ODO-PODMAN-TEST, OpenShift-Integration-tests/OpenShift-Integration-tests, windows-integration-test/Windows-test

In response to this:

/override ODO-PODMAN-TEST
/override OpenShift-Integration-tests/OpenShift-Integration-tests
/override windows-integration-test/Windows-test

Overriding the above tests since their failure is not related to the changes in this PR.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[rm3l]

On an unrelated note, we need to modify the IBM pipelines to not trigger a run when a change is made to .github and certain scripts.

Yes, that would be nice. #6854 did a similar thing for doc-only changes, but we could extend this to ignore more changes.

EDIT: I've created #6918 to track this.