vtorc: wait for ackers before solving PrimarySemiSyncMustBeSet problem

[timvaillancourt]

Description

This PR makes the VTOrc problem PrimarySemiSyncMustBeSet require a minimum number of replicas have semi-sync enabled and are actively replicating, in order to avoid stalls in writes if the PRIMARY enables semi-sync without ackers

Also, @mattlord is added to the VTOrc CODEOWNERS 🎉 🙇

Related Issue(s)

Resolves #18712

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

AI Disclosure

[vitess-bot]

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[timvaillancourt]

We already have this data if we observe 2 x existing values from the GetDetectionAnalysis query, but we can't be certain both counts refer to the exact same instances, so this new value is added

[codecov]

Codecov Report

❌ Patch coverage is 88.23529% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.50%. Comparing base (3d7f63e) to head (bf6579f).
⚠️ Report is 49 commits behind head on main.

Files with missing lines	Patch %	Lines
go/vt/vtorc/inst/analysis.go	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #18732      +/-   ##
==========================================
- Coverage   67.50%   67.50%   -0.01%     
==========================================
  Files        1605     1605              
  Lines      263756   263820      +64     
==========================================
+ Hits       178046   178087      +41     
- Misses      85710    85733      +23     

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