Add comments to the commit instead of to a PR

[jdraymon]

Description

Typically, terraform apply jobs to an environment will not occur as a result of a PR, but rather after merging to the main branch. It is still desirable to have a durable record of the results of plan/apply, however, so it would be helpful to have an option to direct the comment to a specific commit instead of to the PR.

Proposed input change:
Change commentOnPr from a boolean to a string input:

  commentMode:
    description: Where to comment the results of the operation; on the `commit`, the `pr`, or `none` of the above
    default: pr
    required: false

References

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Help Wanted

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