Fix users attribute of iam_group data source

[ftalburt]

Summary

The current implementation of the aws_iam_group data source only retrieves the first 100 users in an IAM group. This PR updates the code to page through the API response and return the full list of users.

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Relates #7076

Release note for CHANGELOG:

Add ability for aws_iam_group data source to retrieve more than 100 users

Output from acceptance testing:

$ make testacc TEST=./aws TESTARGS='-run=TestAccAWSDataSourceIAMGroup_users'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -count 1 -parallel 20 -run=TestAccAWSDataSourceIAMGroup_users -timeout 120m
=== RUN   TestAccAWSDataSourceIAMGroup_users
=== PAUSE TestAccAWSDataSourceIAMGroup_users
=== CONT  TestAccAWSDataSourceIAMGroup_users
--- PASS: TestAccAWSDataSourceIAMGroup_users (204.28s)
PASS
ok      github.com/terraform-providers/terraform-provider-aws/aws       204.341s

[bflad]

LGTM, thanks for this fix, @ftalburt 🚀

Output from acceptance testing:

--- PASS: TestAccAWSDataSourceIAMGroup_basic (10.21s)
--- PASS: TestAccAWSDataSourceIAMGroup_users (291.17s)

[ghost]

This has been released in version 2.40.0 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 for triage. Thanks!

[ghost]

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