tabletmanager: remove v22 backwards-compatibility for vterrors migration

[timvaillancourt]

Description

In v23 PR #18565, tabletmanager was migrated to returning vterrors-style errors

To make the change v22-backwards-compatible, both the old gRPC error codes and vterrors codes were supported

This PR removes the backwards compatibility for v22, for v24. The throttler, which this PR impacts, uses the .CheckThrottler(...) RPC on TMClient only, which uses the correct vterrors now

Finally, this adds a new MySQL throttler config field: IgnoreTabletRPCErrors, to reflect that we are catching new error conditions, such as timeouts and cancellations. This is added to replace IgnoreDialTCPErrors in a future release. For now both are aliased to each other

cc @shlomi-noach who reviewed the first phase of this error migration 🙇

Related Issue(s)

Resolves #18663

Checklist

• "Backport to:" labels have been added if this change should be back-ported to release branches
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• Tests were added or are not required
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• Documentation was added or is not required

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[timvaillancourt]

I plan to deprecate/replace IgnoreDialTCPErrors, because we're catching more than just dial errors (timeouts, cancels, etc)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.80%. Comparing base (1f49de4) to head (2cf528f).
⚠️ Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #18986      +/-   ##
==========================================
+ Coverage   69.77%   69.80%   +0.02%     
==========================================
  Files        1608     1610       +2     
  Lines      214908   215292     +384     
==========================================
+ Hits       149953   150285     +332     
- Misses      64955    65007      +52     

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