[metasrv] refactor: clean up meta-store test

[drmingdrmer]

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Summary

[metasrv] refactor: clean up meta-store test

Changelog

• Improvement

Related Issues

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[codecov-commenter]

Codecov Report

Merging #3925 (ddf2bba) into main (82e6e4c) will decrease coverage by 0%.
The diff coverage is 87%.

@@          Coverage Diff          @@
##            main   #3925   +/-   ##
=====================================
- Coverage     56%     56%   -1%     
=====================================
  Files        800     801    +1     
  Lines      42754   42714   -40     
=====================================
- Hits       24350   24321   -29     
+ Misses     18404   18393   -11     

Impacted Files	Coverage Δ
common/meta/raft-store/src/state/raft_state.rs	27% <ø> (ø)
common/meta/sled-store/src/sled_serde.rs	100% <ø> (ø)
common/meta/types/src/applied_state.rs	50% <ø> (ø)
common/meta/types/src/cluster.rs	88% <ø> (ø)
common/meta/types/src/cmd.rs	100% <ø> (ø)
common/meta/types/src/log_entry.rs	100% <ø> (ø)
common/meta/types/src/message.rs	95% <ø> (ø)
common/meta/types/src/raft_types.rs	33% <ø> (+16%)	⬆️
metasrv/src/errors.rs	24% <0%> (+<1%)	⬆️
metasrv/src/store/to_storage_error.rs	44% <44%> (ø)
... and 19 more

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