vtorc: remove dupe keyspace/shard in replication analysis

[timvaillancourt]

Description

This PR removes the ClusterDetails field from inst.ReplicationAnalysis in VTOrc

The ClusterDetails field uses the struct: inst.ClusterInfo which contains only duplicated fields that already exist in inst.ReplicationAnalysis: AnalyzedKeyspace and AnalyzedShard (both string)

Related Issue(s)

Part of cleanup ahead of implementing protobufs in #18251

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]

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[codecov]

Codecov Report

Attention: Patch coverage is 37.50000% with 10 lines in your changes missing coverage. Please review.

Project coverage is 67.49%. Comparing base (8d2c08c) to head (d0a1926).
Report is 15 commits behind head on main.

Files with missing lines	Patch %	Lines
go/vt/vtorc/logic/topology_recovery_dao.go	0.00%	8 Missing ⚠️
go/vt/vtorc/logic/topology_recovery.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #18395      +/-   ##
==========================================
- Coverage   67.49%   67.49%   -0.01%     
==========================================
  Files        1603     1603              
  Lines      262448   262475      +27     
==========================================
+ Hits       177145   177163      +18     
- Misses      85303    85312       +9     

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[GuptaManan100]

Good catch!