enhance: add CMEK compatibility validation for snapshot restore

[weiliu1031]

Summary

• Add CMEK compatibility validation for snapshot restore operations
• Ensure encryption zone matching between source snapshot and target database
• Fix schema.DbName not being set correctly during restore

Changes

• Add validateCMEKCompatibility function to enforce encryption rules:
  • Non-encrypted snapshots can only restore to non-encrypted databases
  • Encrypted snapshots can only restore to databases with matching ezID
• Add DescribeDatabase broker method to retrieve target database properties
• Fix schema.DbName not being set in RestoreCollection
• Fix DbName field missing in convertModelToDesc response

Test plan

• Unit tests added for all CMEK validation scenarios (8 test cases)
• Unit test added for RestoreCollection schema handling

issue: #44358

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[codecov]

Codecov Report

❌ Patch coverage is 58.06452% with 26 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.45%. Comparing base (2572770) to head (be69376).
⚠️ Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/datacoord/broker/coordinator_broker.go	0.00%	17 Missing ⚠️
internal/datacoord/snapshot_manager.go	79.54%	8 Missing and 1 partial ⚠️

❌ Your patch check has failed because the patch coverage (58.06%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.
❌ Your project check has failed because the head coverage (76.45%) is below the target coverage (77.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #47089      +/-   ##
==========================================
- Coverage   76.56%   76.45%   -0.12%     
==========================================
  Files        2016     2016              
  Lines      326928   326362     -566     
==========================================
- Hits       250316   249521     -795     
- Misses      68652    68836     +184     
- Partials     7960     8005      +45     

Components	Coverage Δ
Client	75.68% <ø> (ø)
Core	82.95% <ø> (ø)
Go	74.79% <58.06%> (-0.17%)	⬇️

Files with missing lines	Coverage Δ
internal/rootcoord/root_coord.go	77.42% <100.00%> (+<0.01%)	⬆️
internal/datacoord/snapshot_manager.go	52.52% <79.54%> (+9.41%)	⬆️
internal/datacoord/broker/coordinator_broker.go	92.01% <0.00%> (-7.99%)	⬇️

... and 47 files with indirect coverage changes

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[XuanYang-cn]

/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: weiliu1031, XuanYang-cn
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Details

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