Bug: add rate_control_mode attribute to aws_medialive_channel

[johnsonaj]

Description

Relations

Closes #28970

References

Output from Acceptance Testing

make testacc TESTARGS='-run=TestAccMediaLiveChannel_' PKG=medialive

==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/medialive/... -v -count 1 -parallel 20  -run=TestAccMediaLiveChannel_ -timeout 180m
--- PASS: TestAccMediaLiveChannel_disappears (65.80s)
--- PASS: TestAccMediaLiveChannel_audioDescriptions_codecSettings (66.77s)
--- PASS: TestAccMediaLiveChannel_basic (74.44s)
--- PASS: TestAccMediaLiveChannel_hls (83.42s)
--- PASS: TestAccMediaLiveChannel_updateTags (95.51s)
--- PASS: TestAccMediaLiveChannel_update (117.68s)
--- PASS: TestAccMediaLiveChannel_status (255.92s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/medialive	258.930s

...

[github-actions]

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[github-actions]

This functionality has been released in v4.52.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

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[github-actions]

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