Add support to allow create CMEK Redis instance in terraform

[fuluoduo]

Add support to allow create CMEK Redis instance in terraform

If this PR is for Terraform, I acknowledge that I have:

• Searched through the issue tracker for an open issue that this either resolves or contributes to, commented on it to claim it, and written "fixes {url}" or "part of {url}" in this PR description. If there were no relevant open issues, I opened one and commented that I would like to work on it (not necessary for very small changes).
• Generated Terraform, and ran make test and make lint to ensure it passes unit and linter tests.
• Ensured that all new fields I added that can be set by a user appear in at least one example (for generated resources) or third_party test (for handwritten resources or update tests).
• Ran relevant acceptance tests (If the acceptance tests do not yet pass or you are unable to run them, please let your reviewer know).
• Read the Release Notes Guide before writing my release note below.

Release Note Template for Downstream PRs (will be copied)

redis: Added CMEK key field `customer_managed_key` in `google_redis_instance `

[modular-magician]

Oops! It looks like you're using an unknown release-note type in your changelog entries:

• REPLACEME

Please only use the types listed in https://github.com/GoogleCloudPlatform/magic-modules/blob/master/.ci/RELEASE_NOTES_GUIDE.md.

[modular-magician]

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[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 2 files changed, 76 insertions(+))
Terraform Beta: Diff ( 2 files changed, 76 insertions(+))
TF Validator: Diff ( 3 files changed, 13 insertions(+), 3 deletions(-))

[shuyama1]

@melinath @ScottSuarez Would any of you mind taking a look why TFV tests are failing in this PR? Thanks a lot.

[modular-magician]

Tests analytics

Total tests: 2068
Passed tests 1839
Skipped tests: 226
Failed tests: 3

Action taken

Triggering VCR tests in RECORDING mode for the tests that failed during VCR. Click here to see the failed tests

TestAccPrivatecaCertificateAuthority_subordinateCaActivatedByFirstPartyIssuerOnCreation|TestAccPrivatecaCertificateAuthority_privatecaCertificateAuthoritySubordinateExample|TestAccSqlUser_mysqlDisabled

[melinath]

It looks like they broke due to these changes that were merged yesterday: #6141 so, not a blocker for this PR.

[shuyama1]

@melinath Thanks for taking a look!

[modular-magician]

Tests passed during RECORDING mode:
TestAccPrivatecaCertificateAuthority_privatecaCertificateAuthoritySubordinateExample[view]
TestAccSqlUser_mysqlDisabled[view]
TestAccPrivatecaCertificateAuthority_subordinateCaActivatedByFirstPartyIssuerOnCreation[view]

All tests passed
View the build log or the debug log for each test

[shuyama1]

Thank you!