[7.15](backport #28589) [CI]: use the downstream packaging pipeline for branches/tags

[mergify]

This is an automatic backport of pull request #28589 done by Mergify.

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[elasticmachine]

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Build stats

• Start Time: 2021-10-26T10:22:40.919+0000

• Duration: 191 min 57 sec

• Commit: d3660f8

Test stats 🧪

Test	Results
Failed	0
Passed	47976
Skipped	5205
Total	53181

💚 Flaky test report

Tests succeeded.

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