🌱 Configure AWS SDK clients directly, rather than setting environment variables

[TylerGillson]

Summary

We should not be using env vars to implicitly configure AWS SDK clients. We should configure them explicitly using the SDK constructor. Env vars can be defaults (provided by the Helm charts) that get overridden with explicit auth per AWSValidator. This is more idiomatic and prevents contention between multiple AWSValidators reconciled concurrently with differing auth configuration. Currently that is not an issue because we don't support configuring MaxConcurrentReconciles, but is a good improvement nevertheless.

[dosubot]

Hi, @TylerGillson. I'm Dosu, and I'm helping the validator-plugin-aws team manage their backlog. I'm marking this issue as stale.

Issue Summary:

• You proposed configuring AWS SDK clients directly via the SDK constructor.
• This approach is more idiomatic and avoids conflicts with multiple AWSValidators.
• The current setup works due to the lack of MaxConcurrentReconciles support.
• No further activity or comments have been made on this issue.

Next Steps:

• Please let me know if this issue is still relevant to the latest version of the validator-plugin-aws repository by commenting here.
• If there is no response, the issue will be automatically closed in 7 days.

Thank you for your understanding and contribution!