📖 Rename diagrams ending with .puml to .plantuml

[oscr]

What this PR does / why we need it:

I noticed a diagram wasn't regenerated. Found it was due to file ending .puml instead of .plantuml. So I renamed the diagrams I found and regenerated them.

[k8s-ci-robot]

@oscr: This issue is currently awaiting triage.

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[stmcginnis]

/lgtm

Good to be consistent.

[killianmuldoon]

/lgtm

[sbueringer]

thx!

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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[sbueringer]

/cherry-pick release-1.2

[k8s-infra-cherrypick-robot]

@sbueringer: new pull request created: #7071

In response to this:

/cherry-pick release-1.2

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.