d/aws_lb_target_group: Add missing schema attributes

[ewbankkit]

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Fixes #8209.

Acceptance tests:

$ make testacc TEST=./aws/ TESTARGS='-run=TestAccDataSourceAWSALBTargetGroup_'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws/ -v -parallel 20 -run=TestAccDataSourceAWSALBTargetGroup_ -timeout 120m
=== RUN   TestAccDataSourceAWSALBTargetGroup_basic
=== PAUSE TestAccDataSourceAWSALBTargetGroup_basic
=== CONT  TestAccDataSourceAWSALBTargetGroup_basic
--- PASS: TestAccDataSourceAWSALBTargetGroup_basic (194.32s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	194.348s

See #8209 (comment) for how the same test was failing before this PR.

[ewbankkit]

The proxy_protocol_v2 and target_type attributes were also missing from the data source but since d.Set() return value isn't usually checked for "simple" attribute types, no errors were returned.
The documentation says:

See the LB Target Group Resource for details on the returned attributes - they are identical.

The name_prefix attribute isn't returned as it is not applicable to the data source.

[ewbankkit]

I re-ordered some attributes to match the order in the resource definition.

[bflad]

LGTM, thanks so much @ewbankkit 🚀

--- PASS: TestAccDataSourceAWSALBTargetGroup_basic (296.14s)

[bflad]

This has been released in version 2.6.0 of the Terraform AWS provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!