Add retries to 'Set label for route reflector' task

[forselli-stratio]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change
/kind bug
/kind cleanup
/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:
This PR adds retries to the task 'Calico-rr | Set label for route reflector' to fix linked issue.

Which issue(s) this PR fixes:
Fixes #7644

[k8s-ci-robot]

Hi @forselli-stratio. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[oomichi]

/ok-to-test
/lgtm

[floryut]

👍

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floryut, forselli-stratio

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