Improve tablet types to wait

[ejortegau]

Description

This PR improves handling of vtgate --tablet_types_to_wait so that timeouts waiting for tablets are interpreted
as not having successfully gotten healthchecks for all tablet types in all keyspaces of interest, leading to
retries instead of simply logging the error and continuing.

Related Issue(s)

#17412

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
• Did the new or modified tests pass consistently locally and on CI?
• Documentation was added or is not required

Deployment Notes

N/A

[vitess-bot]

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[codecov]

Codecov Report

Attention: Patch coverage is 37.50000% with 15 lines in your changes missing coverage. Please review.

Project coverage is 67.73%. Comparing base (fd1186c) to head (bc1d135).
Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
go/vt/vtgate/vtgate.go	0.00%	14 Missing ⚠️
go/vt/vtgate/tabletgateway.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17622      +/-   ##
==========================================
- Coverage   67.75%   67.73%   -0.02%     
==========================================
  Files        1586     1587       +1     
  Lines      255726   255798      +72     
==========================================
+ Hits       173261   173274      +13     
- Misses      82465    82524      +59     

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[ejortegau]

We need two tablets here because the vtgate start-up script waits for primary,replica and with a single tablet we end up with no replicas.