DirectConnect Connection & LAG: provider_name -> Computed

[ewbankkit]

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Closes #21068.
Relates #17852.

Output from acceptance testing:

% make testacc TESTARGS='-run=TestAccAwsDxConnection_\|TestAccAwsDxLag_'                                                             
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -count 1 -parallel 20 -run=TestAccAwsDxConnection_\|TestAccAwsDxLag_ -timeout 180m
=== RUN   TestAccAwsDxConnection_basic
=== PAUSE TestAccAwsDxConnection_basic
=== RUN   TestAccAwsDxConnection_disappears
=== PAUSE TestAccAwsDxConnection_disappears
=== RUN   TestAccAwsDxConnection_ProviderName
=== PAUSE TestAccAwsDxConnection_ProviderName
=== RUN   TestAccAwsDxConnection_Tags
=== PAUSE TestAccAwsDxConnection_Tags
=== RUN   TestAccAwsDxLag_basic
=== PAUSE TestAccAwsDxLag_basic
=== RUN   TestAccAwsDxLag_ProviderName
=== PAUSE TestAccAwsDxLag_ProviderName
=== RUN   TestAccAwsDxLag_disappears
=== PAUSE TestAccAwsDxLag_disappears
=== RUN   TestAccAwsDxLag_Tags
=== PAUSE TestAccAwsDxLag_Tags
=== CONT  TestAccAwsDxConnection_basic
=== CONT  TestAccAwsDxLag_ProviderName
=== CONT  TestAccAwsDxLag_basic
=== CONT  TestAccAwsDxLag_disappears
=== CONT  TestAccAwsDxConnection_Tags
=== CONT  TestAccAwsDxConnection_disappears
=== CONT  TestAccAwsDxLag_Tags
=== CONT  TestAccAwsDxConnection_ProviderName
--- PASS: TestAccAwsDxConnection_disappears (20.92s)
--- PASS: TestAccAwsDxLag_disappears (22.80s)
--- PASS: TestAccAwsDxConnection_basic (25.56s)
--- PASS: TestAccAwsDxConnection_ProviderName (27.93s)
--- PASS: TestAccAwsDxLag_ProviderName (28.42s)
--- PASS: TestAccAwsDxLag_basic (40.31s)
--- PASS: TestAccAwsDxConnection_Tags (51.05s)
--- PASS: TestAccAwsDxLag_Tags (54.65s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	58.220s

[github-actions]

This functionality has been released in v3.61.0 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]

I'm going to lock this pull request because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
If you have found a problem that seems related to this change, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.