docs: add keep-since to TektonConfig docs

[avinal]

Changes

• Adds keep-since to TektonConfig docs
• Type Declaration: https://github.com/tektoncd/operator/blob/main/pkg/apis/operator/v1alpha1/tektonconfig_types.go#L58-L61
• Mutually exclusive keep and keep-since: https://github.com/tektoncd/operator/blob/main/pkg/apis/operator/v1alpha1/tektonconfig_validation.go#L77-L81
• Fixes tektoncd/website#419, RHDEVDOCS-4312
• Blocked by #1025

Signed-off-by: Avinal Kumar [email protected]

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Release Notes

[tekton-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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• :white_check_mark: login: avinal / name: Avinal Kumar (c5fef2adf72e361a00bdff82d7d9ef3ee5cd2c2e)

[tekton-robot]

Hi @avinal. Thanks for your PR.

I'm waiting for a tektoncd 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.

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[tekton-robot]

@avinal: Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

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[tekton-robot]

Issues go stale after 90d of inactivity. Mark the issue as fresh with /remove-lifecycle stale with a justification. Stale issues rot after an additional 30d of inactivity and eventually close. If this issue is safe to close now please do so with /close with a justification. If this issue should be exempted, mark the issue as frozen with /lifecycle frozen with a justification.

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[avinal]

Closing in favor of #1025