[8.x] functionaltests: add first test case (backport #14935) #15284
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Motivation/summary
Implement first test verifying upgrade from 8.15.4 to 8.16.0 for a fresh Elastic Cloud deployment.
Provides a new folder structure and helpers to quickly implement functional tests for APM Server on Elastic Cloud.
Checklist
None
How to test these changes
Run
cd functionaltests && go test -v ./
Related issues
Part of #14100
This is an automatic backport of pull request #14935 done by [Mergify](https://mergify.com).