Make scope optional for google_compute_(region_)resize_request so that the default can be taken from the provider configuration

[askubis]

Makes it consistent with the other compute resources, especially in the instance_group_manager family.

compute: Allow google_compute_(region_)resize_request to not provide scope and use the provider default.

[github-actions]

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[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.

google provider: Diff ( 3 files changed, 15 insertions(+), 15 deletions(-))
google-beta provider: Diff ( 4 files changed, 22 insertions(+), 22 deletions(-))

[modular-magician]

Tests analytics

Total tests: 1100
Passed tests: 1025
Skipped tests: 75
Affected tests: 0

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• compute

🟢 All tests passed!

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