Add milestone applier for k/website

[Rishit-dagli]

Add milestone applier configuration for dev-1.29

/kind cleanup
/kind documentation
/cc @kubernetes/sig-docs-leads

[divya-mohan0209]

Hey @Rishit-dagli , per this PR by @sftim , branch protection has been enabled, by default, for ALL branches of k/website. Thank you for adding the milestone applier configuration for dev-1.29!

I'd suggest that we document (or undocument) this in the Release team docs role handbook after reconfirming with Tim and/or others on this PR.

[reylejano]

This step to apply the milestone applier is part of the release team docs role as stated here: https://github.com/kubernetes/sig-release/blob/master/release-team/role-handbooks/docs/Release-Timeline.md#modify-prow-config-file

The milestone applier will add the 1.29 milestone to any PR in the dev-1.29 branch in k/website
/approve

[cblecker]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cblecker, reylejano, Rishit-dagli

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[k8s-ci-robot]

@Rishit-dagli: Updated the plugins configmap in namespace default at cluster test-infra-trusted using the following files:

• key plugins.yaml using file config/prow/plugins.yaml

In response to this:

Add milestone applier configuration for dev-1.29

/kind cleanup
/kind documentation
/cc @kubernetes/sig-docs-leads

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