[7.17](backport #32964) [Metricbeat] Add support for multiple regions in GCP

[mergify]

This is an automatic backport of pull request #32964 done by Mergify.
Cherry-pick of 3bcefab has failed:

On branch mergify/bp/7.17/pr-32964
Your branch is up to date with 'origin/7.17'.

You are currently cherry-picking commit 3bcefabb28.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
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Changes to be committed:
	modified:   CHANGELOG-developer.next.asciidoc
	modified:   x-pack/metricbeat/module/gcp/constants.go
	modified:   x-pack/metricbeat/module/gcp/metadata.go
	modified:   x-pack/metricbeat/module/gcp/metrics/metadata_services.go
	modified:   x-pack/metricbeat/module/gcp/metrics/timeseries.go
	modified:   x-pack/metricbeat/module/gcp/timeseries_metadata_collector.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   x-pack/metricbeat/module/gcp/metrics/compute/metadata.go
	both modified:   x-pack/metricbeat/module/gcp/metrics/metrics_requester.go
	both modified:   x-pack/metricbeat/module/gcp/metrics/metrics_requester_test.go
	both modified:   x-pack/metricbeat/module/gcp/metrics/metricset.go

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[elasticmachine]

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• Start Time: 2022-09-15T08:37:13.449+0000

• Duration: 21 min 8 sec

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Passed	3
Skipped	0
Total	3

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[endorama]

The code drifted too much for this to be backported easily and we don't backport features to latest major releases. Closing unmerged.