Fix/expire-prev-epochs-redux

[dandanlen]

TEMP: opening this PR to investigate recent issues.

[codecov]

Codecov Report

Attention: Patch coverage is 83.45865% with 22 lines in your changes missing coverage. Please review.

Project coverage is 71%. Comparing base (99bc666) to head (9341ad5).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
state-chain/custom-rpc/src/monitoring.rs	0%	14 Missing ⚠️
state-chain/runtime/src/lib.rs	0%	1 Missing and 3 partials ⚠️
state-chain/pallets/cf-validator/src/lib.rs	86%	3 Missing ⚠️
state-chain/custom-rpc/src/lib.rs	0%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##            main   #5371    +/-   ##
======================================
- Coverage     72%     71%    -0%     
======================================
  Files        497     498     +1     
  Lines      86352   86267    -85     
  Branches   86352   86267    -85     
======================================
- Hits       61757   61609   -148     
- Misses     21817   21874    +57     
- Partials    2778    2784     +6     

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