feat: add label when pr has conflicts

[msvticket]

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[jenkins-x-bot]

[jx-info] Hi, we've detected that the pipelines in this repository are using a syntax that will soon be deprecated.
We'll continue to update you through PRs as we progress. Please check #8589 for further information.

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[jenkins-x-bot]

@msvticket: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
pr	d93d855	link	/test

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