Feature request: Support canary release for regional instance group manager

[oceyral]

Issue #1252 and PR #1499 discussed and implemented the support for multiple versions in the google_compute_instance_group_manager resource.

It would be nice to have that same support for the google_compute_regional_instance_group_manager resource.

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

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