Split initialization check into a distinct workflow

[justinretzolk]

Rollback Plan

If a change needs to be reverted, we will publish an updated version of the library.

Changes to Security Controls

Are there any changes to security controls (access controls, encryption, logging) in this pull request? If so, explain.

Description

This PR copies the initialization check workflow that was recently introduced in the AWSCC provider over to the mainline provider.

Relations

Relates hashicorp/terraform-provider-awscc#2303
Relates hashicorp/terraform-provider-awscc#2313

Output from Acceptance Testing

N/a, workflows

[github-actions]

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[jar-b]

LGTM 🚀