refactor(storage,storagenode): remove unnecessary codes related to legacy commit context

[ijsong]

What this PR does

This patch removes unnecessary codes related to legacy commit context and
finalizes the
RFC.

Which issue(s) this PR resolves

Updates #149

[codecov-commenter]

Codecov Report

Base: 63.15% // Head: 63.10% // Decreases project coverage by -0.05% ⚠️

Coverage data is based on head (d8f736f) compared to base (c3066b8).
Patch coverage: 71.42% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #292      +/-   ##
==========================================
- Coverage   63.15%   63.10%   -0.06%     
==========================================
  Files         130      130              
  Lines       17357    17308      -49     
==========================================
- Hits        10962    10922      -40     
+ Misses       5841     5834       -7     
+ Partials      554      552       -2     

Impacted Files	Coverage Δ
internal/storage/encode.go	96.72% <ø> (-1.34%)	⬇️
internal/storage/recovery_points.go	90.69% <63.63%> (-5.23%)	⬇️
internal/storage/commit_batch.go	100.00% <100.00%> (ø)
internal/storagenode/replication_server.go	76.27% <0.00%> (-2.55%)	⬇️
internal/metarepos/raft_metadata_repository.go	76.48% <0.00%> (-0.18%)	⬇️
internal/metarepos/report_collector.go	77.42% <0.00%> (+0.42%)	⬆️
internal/metarepos/storage.go	79.22% <0.00%> (+0.53%)	⬆️
internal/storagenode/logstream/executor.go	81.48% <0.00%> (+1.20%)	⬆️

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[hungryjang]

good bye cc