Add support for Composer image version aliases like composer-2

[swalkowski]

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Description

Cloud Composer is adding support for Composer major version aliases within image version specification, like composer-1 and composer-2. This will enable requesting a Cloud Composer 2 without specifying the full semantic version.

We should support these aliases in Terraform.

New or Affected Resource(s)

• google_composer_environment

Potential Terraform Configuration

resource "google_composer_environment" "test" {
  name   = "example-composer-env"
  region = "us-central1"
 
 config {
    software_config {
      image_version = "composer-2-airflow-2.2.3"
    }
  }
}

[swalkowski]

I have prepared a code change for this, will send out a PR soon.

[c2thorn]

Note to the TF team: It looks like this will be supported by the API, however we have some regex in the provider that would have blocked it. The regex will need to be updated at the very least.

[swalkowski]

I have updated the regexp in a few places in GoogleCloudPlatform/magic-modules#5787 draft, please let me know if there is anything I've missed.

[github-actions]

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