Fix tkn pr/tr delete for --keep and --keep-since flag

[pratap0007]

This patch fix the tkn pr delete command for --keep and --keep-since now both flags are working together and --keep-since has the higher priority

fixes : #1990

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[pratap0007]

/test pull-tekton-cli-integration-tests

[pratap0007]

/hold

[tekton-robot]

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/lifecycle stale

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[tekton-robot]

@tekton-robot: Closed this PR.

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Rotten issues close after 30d of inactivity.
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[piyush-garg]

/reopen
/remove-lifecycle rotten

[tekton-robot]

@piyush-garg: Reopened this PR.

In response to this:

/reopen
/remove-lifecycle rotten

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[tekton-robot]

@pratap0007: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-tekton-cli-build-tests	43ab718	link	true	/test pull-tekton-cli-build-tests
pull-tekton-cli-integration-tests	43ab718	link	true	/test pull-tekton-cli-integration-tests

Full PR test history. Your PR dashboard.

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