Watch Keyspace Records in VTOrc instead of polling them

[GuptaManan100]

Description

Related Issue(s)

• RFC/Feature Request: vtorc should make it easy to find audit info related to recoveries #17465

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

[vitess-bot]

Review Checklist

Hello reviewers! 👋 Please follow this checklist when reviewing this Pull Request.

General

• Ensure that the Pull Request has a descriptive title.
• Ensure there is a link to an issue (except for internal cleanup and flaky test fixes), new features should have an RFC that documents use cases and test cases.

Tests

• Bug fixes should have at least one unit or end-to-end test, enhancement and new features should have a sufficient number of tests.

Documentation

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• New features should be documented.
• There should be some code comments as to why things are implemented the way they are.
• There should be a comment at the top of each new or modified test to explain what the test does.

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Backward compatibility

• Protobuf changes should be wire-compatible.
• Changes to _vt tables and RPCs need to be backward compatible.
• RPC changes should be compatible with vitess-operator
• If a flag is removed, then it should also be removed from vitess-operator and arewefastyet, if used there.
• vtctl command output order should be stable and awk-able.

[codecov]

Codecov Report

Attention: Patch coverage is 39.08629% with 120 lines in your changes missing coverage. Please review.

Project coverage is 67.70%. Comparing base (d1aa2f4) to head (30949f7).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
go/vt/vtorc/logic/keyspace_shard_discovery.go	0.00%	46 Missing ⚠️
go/vt/vtorc/logic/tablet_discovery.go	0.00%	44 Missing ⚠️
go/vt/topo/keyspace.go	78.02%	20 Missing ⚠️
go/vt/key/key.go	0.00%	5 Missing ⚠️
go/vt/vtorc/logic/vtorc.go	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17553      +/-   ##
==========================================
+ Coverage   67.68%   67.70%   +0.01%     
==========================================
  Files        1586     1586              
  Lines      255170   255486     +316     
==========================================
+ Hits       172722   172982     +260     
- Misses      82448    82504      +56     

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