Refactor grpc flags for standardized naming

[mounicasruthi]

Description

This PR is a part of an ongoing change to support the transition from underscores (_) to dashes (-) in flag naming conventions.

Flags Updated in This PR:
--grpc-auth-mode
--grpc-auth-mtls-allowed-substrings
--grpc-auth-static-client-creds
--grpc-auth-static-password-file
--grpc-bind-address
--grpc-ca
--grpc-cert
--grpc-compression
--grpc-crl
--grpc-dial-concurrency-limit
--grpc-enable-optional-tls
--grpc-enable-tracing
--grpc-initial-conn-window-size
--grpc-initial-window-size
--grpc-keepalive-time
--grpc-keepalive-timeout
--grpc-key
--grpc-max-connection-age
--grpc-max-connection-age-grace
--grpc-max-message-size
--grpc-port
--grpc-prometheus
--grpc-server-ca
--grpc-server-initial-conn-window-size
--grpc-server-initial-window-size
--grpc-server-keepalive-enforcement-policy-min-time
--grpc-server-keepalive-enforcement-policy-permit-without-stream
--grpc-server-keepalive-time
--grpc-server-keepalive-timeout
--grpc-use-effective-callerid
--grpc-use-effective-groups
--grpc-use-static-authentication-callerid

Flag Count Before vs After:

	Flags with _	Flags with -
Before	1366	694
After	1132	948

# of migrated flags: 234

Related Issue(s)

#17880

Checklist

• "Backport to:" labels have been added if this change should be back-ported to release branches
• If this change is to be back-ported to previous releases, a justification is included in the PR description
• Tests were added or are not required
• Did the new or modified tests pass consistently locally and on CI?
• Documentation was added or is not required

[vitess-bot]

Review Checklist

Hello reviewers! 👋 Please follow this checklist when reviewing this Pull Request.

General

• Ensure that the Pull Request has a descriptive title.
• Ensure there is a link to an issue (except for internal cleanup and flaky test fixes), new features should have an RFC that documents use cases and test cases.

Tests

• Bug fixes should have at least one unit or end-to-end test, enhancement and new features should have a sufficient number of tests.

Documentation

• Apply the release notes (needs details) label if users need to know about this change.
• New features should be documented.
• There should be some code comments as to why things are implemented the way they are.
• There should be a comment at the top of each new or modified test to explain what the test does.

New flags

• Is this flag really necessary?
• Flag names must be clear and intuitive, use dashes (-), and have a clear help text.

If a workflow is added or modified:

• Each item in Jobs should be named in order to mark it as required.
• If the workflow needs to be marked as required, the maintainer team must be notified.

Backward compatibility

• Protobuf changes should be wire-compatible.
• Changes to _vt tables and RPCs need to be backward compatible.
• RPC changes should be compatible with vitess-operator
• If a flag is removed, then it should also be removed from vitess-operator and arewefastyet, if used there.
• vtctl command output order should be stable and awk-able.

[codecov]

Codecov Report

Attention: Patch coverage is 76.36364% with 13 lines in your changes missing coverage. Please review.

Project coverage is 67.57%. Comparing base (0a9d1ee) to head (469b3db).
Report is 1 commits behind head on flags-refactor.

Files with missing lines	Patch %	Lines
go/vt/vtgate/grpcvtgateservice/server.go	20.00%	4 Missing ⚠️
go/vt/servenv/grpc_server_auth_static.go	33.33%	2 Missing ⚠️
go/vt/vttest/local_cluster.go	0.00%	2 Missing ⚠️
go/vt/vttest/vtprocess.go	33.33%	2 Missing ⚠️
go/cmd/vtadmin/main.go	0.00%	1 Missing ⚠️
go/vt/utils/flags.go	85.71%	1 Missing ⚠️
go/vt/vtctl/vtctl.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                 @@
##           flags-refactor   #18009      +/-   ##
==================================================
+ Coverage           67.54%   67.57%   +0.02%     
==================================================
  Files                1598     1598              
  Lines              259808   259817       +9     
==================================================
+ Hits               175497   175566      +69     
+ Misses              84311    84251      -60     

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[rohit-nayak-ps]

lgtm

[rohit-nayak-ps]

Let's add this to git for now. We can remove once the refactor is done. You can do this in a future PR, don't want to hold this one up for it.