Rolls back AWS SDK modules with shared config parsing bug

[gdavison]

Description

Rolls back github.com/aws/aws-sdk-go-v2/config and github.com/aws/aws-sdk-go-v2/internal/ini versions which contain shared config file parsing bug aws/aws-sdk-go-v2#2349

Adds exclusions to go.mod file and adds test for this regression

Relates #34234.
Closes #34257.

Output from Acceptance Testing

% go test -v ./internal/provider/... -run=TestSharedConfigFileParsing

--- PASS: TestSharedConfigFileParsing (0.08s)
    --- PASS: TestSharedConfigFileParsing/leading_whitespace (0.08s)

[github-actions]

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[ewbankkit]

LGTM 🚀.

[ewbankkit]

Needs a CHANGELOG entry or entries if this fixes the 2 INI parsing issues.

[ewbankkit]

Will we need to do something to our dependabot configuration to prevent newer, non-excluded, versions of github.com/aws/aws-sdk-go-v2/config being merged?

[github-actions]

This functionality has been released in v5.25.0 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. Thank you!

[github-actions]

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