Cherry-pick to 7.x: [CI] Run mandatory stages when only x-pack changes on branches/tags (#23487)#23498

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v1v merged 1 commit intoelastic:7.xfrom v1v:backport/7.x/pr-23487

Jan 15, 2021

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Commits on Jan 14, 2021

[CI] Run mandatory stages when only x-pack changes on branches/tags (elastic#23487 )
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