slack-19.0: tabletmanager: map sqlerrors to vtrpcpb/gRPC error codes

[timvaillancourt]

Description

This PR is an early backport of vitessio#18565 to slack-19.0

Before w/mysqld killed

rpc error: code = Unknown desc = TabletManager.StopReplicationAndGetStatus on REDACTED-TABLETALIAS: before status failed: net.Dial(/mnt/vitess/mysql/datadir/mysql.sock) to local server failed: dial unix /mnt/vitess/mysql/datadir/mysql.sock: connect: connection refused (errno 2002) (sqlstate HY000)

After w/mysqld killed + test client

rpc error: code = Unavailable desc = TabletManager.StopReplicationAndGetStatus on REDACTED-TABLETALIAS: before status failed: net.Dial(/mnt/vitess/mysql/datadir/mysql.sock) to local server failed: dial unix /mnt/vitess/mysql/datadir/mysql.sock: connect: connection refused (errno 2002) (sqlstate HY000)

🎉

Related Issue(s)

vitessio#18565

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

Deployment Notes

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[github-actions]

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