Add locations field to mirroring deployment group.

[duvni]

Add the new locations output field to Mirroring Deployment Group resource.
Used to expose the locations where the deployment group is currently deployed.

networksecurity: added `locations` field to `google_network_security_mirroring_deployment_group` resource

[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, 78 insertions(+))
google-beta provider: Diff ( 3 files changed, 78 insertions(+))

[modular-magician]

Tests analytics

Total tests: 61
Passed tests: 57
Skipped tests: 4
Affected tests: 0

Click here to see the affected service packages

• networksecurity

🟢 All tests passed!

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[github-actions]

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