Add CodePipeline cross-region action support

[gdavison]

This PR picks up on the work done by @bashton-ajenkins in #7866 to add cross-region actions.

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Closes #7866
Closes #6871

Release note for CHANGELOG:

resource/aws_codepipeline: Adds cross-region action support

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccAWSCodePipeline_'

--- PASS: TestAccAWSCodePipeline_emptyArtifacts (33.68s)
--- PASS: TestAccAWSCodePipeline_deployWithServiceRole (43.31s)
--- PASS: TestAccAWSCodePipeline_multiregion_basic (43.95s)
--- PASS: TestAccAWSCodePipeline_basic (57.33s)
--- PASS: TestAccAWSCodePipeline_multiregion_Update (66.48s)
--- PASS: TestAccAWSCodePipeline_tags (76.28s)
--- PASS: TestAccAWSCodePipeline_multiregion_ConvertSingleRegion (82.51s)

[jrstarke]

@gdavison is there any help you could use on this PR or any way that the community could help move this forward :)

[bflad]

Overall this is looking pretty good, just requesting some changes for the testing. 👍

[bflad]

Looks great 🚀

Output from acceptance testing:

--- PASS: TestResourceAWSCodePipelineExpandArtifactStoresValidation (0.00s)
--- PASS: TestAccAWSCodePipelineWebhook_basic (24.22s)
--- PASS: TestAccAWSCodePipeline_basic (33.62s)
--- PASS: TestAccAWSCodePipelineWebhook_unauthenticated (34.61s)
--- PASS: TestAccAWSCodePipeline_deployWithServiceRole (36.14s)
--- PASS: TestAccAWSCodePipelineWebhook_ipAuth (37.23s)
--- PASS: TestAccAWSCodePipeline_emptyArtifacts (43.23s)
--- PASS: TestAccAWSCodePipeline_multiregion_basic (48.49s)
--- PASS: TestAccAWSCodePipeline_tags (54.44s)
--- PASS: TestAccAWSCodePipelineWebhook_UpdateAuthenticationConfiguration_SecretToken (59.03s)
--- PASS: TestAccAWSCodePipeline_multiregion_Update (66.93s)
--- PASS: TestAccAWSCodePipelineWebhook_tags (68.17s)
--- PASS: TestAccAWSCodePipeline_multiregion_ConvertSingleRegion (71.34s)

[ghost]

This has been released in version 2.56.0 of the Terraform AWS provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template for triage. Thanks!

[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.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!