[updatecli] update elastic stack version for testing 8.10.0-516050d7

[apmmachine]

Bump elastic-stack to latest snapshot version

Update snapshot.yml

1 file(s) updated with "$1:8.10.0-516050d7-SNAPSHOT": * testing/environments/snapshot.yml

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[elasticmachine]

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Build stats

• Start Time: 2023-09-12T15:09:10.823+0000

• Duration: 81 min 56 sec

Test stats 🧪

Test	Results
Failed	0
Passed	28142
Skipped	2015
Total	30157

💚 Flaky test report

Tests succeeded.

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