fix: resolve yamllint errors and warnings in workflows

[infernus01]

Changes

This PR fixes all yamllint errors and warnings in the GitHub Actions workflow files and config directory.

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• Has Docs if any changes are user facing, including updates to minimum requirements e.g. Kubernetes version bumps
• Has Tests included if any functionality added or changed
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Release Notes

NONE

[infernus01]

/kind misc

[anithapriyanatarajan]

@infernus01 Thankyou for this PR. could you update https://github.com/infernus01/tektoncd-pruner/blob/6946cefc00a5514cd6399841b3efa132a950e05d/.github/workflows/ci.yaml#L71 to false. we do not want to pass ci with yaml lint errors

[anithapriyanatarajan]

/kind misc

[anithapriyanatarajan]

/approve
/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

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