[8.8](backport #35272) Use UID for dockerfile to allow runasNonRoot to be used.

[mergify]

This is an automatic backport of pull request #35272 done by Mergify.

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[elasticmachine]

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• Start Time: 2023-05-05T15:18:37.524+0000

• Duration: 64 min 24 sec

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Test	Results
Failed	0
Passed	25
Skipped	5
Total	30

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[cmacknz]

/test x-pack/metricbeat-pythonIntegTest