beats [7.17](backport #35060) [GCP] Migrate away from go-genproto in GCP module

This is an automatic backport of pull request #35060 done by Mergify. Cherry-pick of a1d968e11fb327d8eeb2d7960142bc911b9199b3 has failed:

On branch mergify/bp/7.17/pr-35060
Your branch is up to date with 'origin/7.17'.

You are currently cherry-picking commit a1d968e11f.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   x-pack/metricbeat/module/gcp/constants.go
	modified:   x-pack/metricbeat/module/gcp/metadata.go
	modified:   x-pack/metricbeat/module/gcp/metrics/compute/metadata.go
	modified:   x-pack/metricbeat/module/gcp/metrics/compute/metadata_test.go

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   x-pack/metricbeat/module/gcp/metrics/cloudsql/metadata.go
	deleted by us:   x-pack/metricbeat/module/gcp/metrics/cloudsql/metadata_test.go
	both modified:   x-pack/metricbeat/module/gcp/metrics/metrics_requester.go
	both modified:   x-pack/metricbeat/module/gcp/metrics/metricset.go
	both modified:   x-pack/metricbeat/module/gcp/metrics/response_parser.go
	both modified:   x-pack/metricbeat/module/gcp/timeseries_metadata_collector.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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Apr 12 '23 13:04 mergify[bot]

:broken_heart: Build Failed

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Build stats

Start Time: 2023-05-03T10:22:39.624+0000
Duration: 72 min 15 sec

Test stats :test_tube:

Test	Results
Failed	0
Passed	21836
Skipped	1542
Total	23378

Steps errors

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`Installing github.com/jstemmer/go-junit-report@latest`

Took 0 min 11 sec . View more details here
Description: go install github.com/jstemmer/go-junit-report@latest

`Installing github.com/jstemmer/go-junit-report@latest`

Took 0 min 11 sec . View more details here
Description: go install github.com/jstemmer/go-junit-report@latest

`Installing github.com/jstemmer/go-junit-report@latest`

Took 0 min 12 sec . View more details here
Description: go install github.com/jstemmer/go-junit-report@latest

`Installing github.com/magefile/mage@latest`

Took 0 min 11 sec . View more details here
Description: go install github.com/magefile/mage@latest

`Installing github.com/jstemmer/go-junit-report@latest`

Took 0 min 11 sec . View more details here
Description: go install github.com/jstemmer/go-junit-report@latest

:green_heart: Flaky test report

Tests succeeded.

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