[8.0](backport #28836) chore: upload files to Google Storage when they exist

[mergify]

This is an automatic backport of pull request #28836 done by Mergify.

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[elasticmachine]

💔 Build Failed

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Build stats

• Start Time: 2021-11-05T13:59:22.042+0000

• Duration: 178 min 37 sec

• Commit: 64ab2b7

Test stats 🧪

Test	Results
Failed	0
Passed	53983
Skipped	5339
Total	59322

Steps errors

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filebeat-goIntegTest - mage goIntegTest

• Took 7 min 26 sec . View more details here
• Description: mage goIntegTest

Google Storage Download

• Took 1 min 18 sec . View more details here

gsutil -m -q cp eC1wYWNrL2ZpbGViZWF0LXdpbmRvd3MtMjAwOC13aW5kb3dzLTIwMDgtcjI2NGFiMmI3MDNjYmQ1YzhjYmE

• Took 0 min 26 sec . View more details here
• Description: gsutil -m -q cp eC1wYWNrL2ZpbGViZWF0LXdpbmRvd3MtMjAwOC13aW5kb3dzLTIwMDgtcjI2NGFiMmI3MDNjYmQ1YzhjYmE3ZWJiMWY4MDU1ZGU0NzUwMDA5MmI5 gs://beats-ci-temp/ci/cache/

💚 Flaky test report

Tests succeeded.

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