[GRPC] Fix compilation errors from core protobuf version bump to 0.23.0

[lucy66hw]

Description

[GRPC] Fix compilation errors from core protobuf version bump to 0.23.0
Core OpenSearch bumped the protobuf version to 0.23.0, which might break compilation in the security plugin's gRPC integration tests

Issues Resolved

[List any issues this PR will resolve]

Is this a backport? If so, please add backport PR # and/or commits #, and remove backport-failed label from the original PR.

Do these changes introduce new permission(s) to be displayed in the static dropdown on the front-end? If so, please open a draft PR in the security dashboards plugin and link the draft PR here

Testing

[Please provide details of testing done: unit testing, integration testing and manual testing]

Check List

• New functionality includes testing
• New functionality has been documented
• New Roles/Permissions have a corresponding security dashboards plugin PR
• API changes companion pull request created
• Commits are signed per the DCO using --signoff

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[karenyrx]

cc @cwperks @finnegancarroll

[finnegancarroll]

Thanks for updating these tests @lucy66hw. I have had limited bandwidth recently but will make a point to address these breaking integration tests for 3.4 as these have been noted to be disruptive to security plugin and need addressing.

[cwperks]

Will merge this if the checks pass as its fixing a compilation issue due to breaking change from the core.