Fix: skip unopted-in AWS regions in aws_ec2 inventory plugin

[armin-x86]

Summary

This pull request improves the robustness of the amazon.aws.aws_ec2 dynamic inventory plugin by gracefully skipping AWS regions that are not opted-in or enabled in the account.

Currently, if a user includes disabled/not enabled regions on their aws account like ap-east-1 or me-south-1 in the regions: list of their inventory config, the plugin throws a misleading AuthFailure error, even though the credentials are valid.

This PR introduces a targeted ClientError handler that:

• Checks if the error is an AuthFailure
• Logs a clear warning
• Skips the region instead of failing the entire inventory load

Before

[WARNING]: * Failed to parse inventory/aws_ec2.yml with auto plugin: Failed to describe instances: An error occurred (AuthFailure) when calling the DescribeInstances operation: AWS was not able to validate the provided access credentials

and no inventory was rendered because having not activated/disabled regions in the regions list.

After

[WARNING]: Region 'ap-east-1' is not enabled for this AWS account. Skipping.

Changelog

• bugfixes:
  • gracefully skip AWS regions that are not opted-in (fix misleading AuthFailure) in aws_ec2 inventory plugin

⚠️ Heads up:

CI is failing due to unrelated warnings in docsite/CHANGELOG.rst (missing references to result and vpc_peering_connections). This appears unrelated to this PR, as it doesn't touch documentation or changelogs involving those terms.

[softwarefactory-project-zuul]

Build failed.
https://ansible.softwarefactory-project.io/zuul/buildset/88e5559d62654a5aa42e164bae66ccb1

✔️ ansible-galaxy-importer SUCCESS in 5m 56s
✔️ build-ansible-collection SUCCESS in 11m 16s
✔️ ansible-test-splitter SUCCESS in 5m 09s
❌ integration-amazon.aws-1 FAILURE in 19m 07s
Skipped 43 jobs

[armin-x86]

Build failed. https://ansible.softwarefactory-project.io/zuul/buildset/88e5559d62654a5aa42e164bae66ccb1

✔️ ansible-galaxy-importer SUCCESS in 5m 56s ✔️ build-ansible-collection SUCCESS in 11m 16s ✔️ ansible-test-splitter SUCCESS in 5m 09s ❌ integration-amazon.aws-1 FAILURE in 19m 07s Skipped 43 jobs

my patch passes all linting and packaging tests. The integration-amazon.aws-1 job failed due to a symlink creation error (ln: failed to create symbolic link 'playbooks/roles/..': File exists), which seems unrelated to the plugin code change.

Could you please help re-run or advise if this is an infra issue?

[armin-x86]

any chance to have it approved?