Revert project service data source to pre-5.0.0

[trodge]

fixes hashicorp/terraform-provider-google#16515

This makes this particular data source an exception to the strategy outlined in hashicorp/terraform-provider-google#12873.

Release Note Template for Downstream PRs (will be copied)

resourcemanager: made `data_source_google_project_service` no longer return an error when service is not enabled

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

Terraform GA: Diff ( 1 file changed, 1 insertion(+), 9 deletions(-))
Terraform Beta: Diff ( 1 file changed, 1 insertion(+), 9 deletions(-))

[modular-magician]

Tests analytics

Total tests: 3225
Passed tests 2896
Skipped tests: 329
Affected tests: 0

$\textcolor{green}{\textsf{All tests passed in REPLAYING mode.}}$
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