fix(cli): region specified in `~/.aws/credentials` is ignored

[iliapolo]

We just didn't consider the shared credentials file as returned by the SDK when loading configuration.

Closes #32130.

Checklist

• [x] My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 77.19%. Comparing base (6b0b1e1) to head (7663a56). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #32133 +/- ## ========================================== + Coverage 77.17% 77.19% +0.02% ========================================== Files 105 105 Lines 7162 7164 +2 Branches 1311 1311 ========================================== + Hits 5527 5530 +3 + Misses 1455 1454 -1 Partials 180 180 ``` | [Flag](https://app.codecov.io/gh/aws/aws-cdk/pull/32133/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aws) | Coverage Δ | | |---|---|---| | [suite.unit](https://app.codecov.io/gh/aws/aws-cdk/pull/32133/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aws) | `77.19% <100.00%> (+0.02%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aws#carryforward-flags-in-the-pull-request-comment) to find out more. | [Components](https://app.codecov.io/gh/aws/aws-cdk/pull/32133/components?src=pr&el=components&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aws) | Coverage Δ | | |---|---|---| | [packages/aws-cdk](https://app.codecov.io/gh/aws/aws-cdk/pull/32133/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aws) | `77.19% <100.00%> (+0.02%)` | :arrow_up: |

[iliapolo]

Exemption from integ because unit tests cover the offending code.

[rix0rrr]

AWS CLI does:

• If --profile: credentials profile > config profile > no region
• If not --profile: credentials default > config default > no region

No region behaves as follows:

• Global services work (IAM, S3, Route53)
• Regional services fail with an error, saying you must specify a region

Traditionally, CDK has defaulted to us-east-1 in this case. I'm like 90% sure we used to do that to copy the AWS CLI, I wonder if they changed their behavior when migrating CLIv1 -> CLIv2

Also CDK traditionally had the behavior that if the profile doesn't have a region, we will take the region from the [default] profile, but apparently the CLI doesn't do that.

EDIT: Ohh, AWS CLIv2 now has a magic aws-global region, that they default to.

[iliapolo]

draft until we sort our credentials priority

[aws-cdk-automation]

:arrow_right: PR build request submitted to test-main-pipeline :arrow_left:

A maintainer must now check the pipeline and add the pr-linter/cli-integ-tested label once the pipeline succeeds.

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Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 7663a56ef50287b53305da8198a3efcca1298ca0
• Result: SUCCEEDED
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