Reset in-memory sequence info on vttablet on UpdateSequenceTables request

[beingnoble03]

Description

This PR fixes the bug where outdated in-memory sequence info was being used after switching traffic even when we updated the next_id in sequence tables using intialize-target-sequences, resulting in duplicate entry errors on the vttablet.

To fix this, we reset sequence counters on sequence tables on the tablet containing the sequence tables whenever we switch traffic. This allows tablet to refetch the updated next_id from the database.

Also added an e2e test TestSequenceResetOnSwitchTraffic which confirms this behaviour.

Related Issue(s)

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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Deployment Notes

[vitess-bot]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 67.50%. Comparing base (d429368) to head (5608115).
Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
go/vt/vttablet/tabletmanager/rpc_vreplication.go	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #18415      +/-   ##
==========================================
- Coverage   67.51%   67.50%   -0.01%     
==========================================
  Files        1607     1607              
  Lines      262684   262714      +30     
==========================================
+ Hits       177343   177344       +1     
- Misses      85341    85370      +29     

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