Adds tests for shared config file parsing

[gdavison]

Adds tests to validate shared config file parsing

Relations

Relates aws/aws-sdk-go-v2#2369

Output from Acceptance Testing

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

--- PASS: TestSharedConfigFileParsing (0.95s)
    --- PASS: TestSharedConfigFileParsing/named_profile_after_leading_newline_and_whitespace (0.20s)
    --- PASS: TestSharedConfigFileParsing/named_profile (0.13s)
    --- PASS: TestSharedConfigFileParsing/trailing_hash (0.14s)
    --- PASS: TestSharedConfigFileParsing/leading_newline (0.20s)
    --- PASS: TestSharedConfigFileParsing/leading_whitespace (0.13s)
    --- PASS: TestSharedConfigFileParsing/leading_newline_and_whitespace (0.16s)

[github-actions]

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[jar-b]

LGTM 🚀

% go test ./internal/provider/... -run=TestSharedConfigFileParsing -v
?       github.com/hashicorp/terraform-provider-aws/internal/provider/fwprovider        [no test files]
=== RUN   TestSharedConfigFileParsing
=== RUN   TestSharedConfigFileParsing/named_profile
=== RUN   TestSharedConfigFileParsing/trailing_hash
=== RUN   TestSharedConfigFileParsing/leading_newline
=== RUN   TestSharedConfigFileParsing/leading_whitespace
=== RUN   TestSharedConfigFileParsing/leading_newline_and_whitespace
=== RUN   TestSharedConfigFileParsing/named_profile_after_leading_newline_and_whitespace
--- PASS: TestSharedConfigFileParsing (0.44s)
    --- PASS: TestSharedConfigFileParsing/named_profile (0.08s)
    --- PASS: TestSharedConfigFileParsing/trailing_hash (0.07s)
    --- PASS: TestSharedConfigFileParsing/leading_newline (0.07s)
    --- PASS: TestSharedConfigFileParsing/leading_whitespace (0.07s)
    --- PASS: TestSharedConfigFileParsing/leading_newline_and_whitespace (0.07s)
    --- PASS: TestSharedConfigFileParsing/named_profile_after_leading_newline_and_whitespace (0.07s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/provider   3.734s

[github-actions]

This functionality has been released in v5.26.0 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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