[CSUB-845][hotfix] Split cleanup of expired entries across multiple blocks

[nathanwhit]

Description of proposed changes

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Practical tips for PR review & merge:

• All GitHub Actions report PASS
• Newly added code/functions have unit tests
  • Coverage tools report all newly added lines as covered
  • The positive scenario is exercised
  • Negative scenarios are exercised, e.g. assert on all possible errors
  • Assert on events triggered if applicable
  • Assert on changes made to storage if applicable
• Modified behavior/functions - try to make sure above test items are covered
• Integration tests are added if applicable/needed

[codecov-commenter]

Codecov Report

Merging #1352 (a59e86e) into main (1aa0996) will increase coverage by 2.17%.
The diff coverage is 97.34%.

@@            Coverage Diff             @@
##             main    #1352      +/-   ##
==========================================
+ Coverage   68.93%   71.11%   +2.17%     
==========================================
  Files         103      106       +3     
  Lines       12095    12470     +375     
  Branches      114      114              
==========================================
+ Hits         8338     8868     +530     
+ Misses       3757     3593     -164     
- Partials        0        9       +9     

Files	Coverage Δ
pallets/creditcoin/src/mock.rs	100.00% <ø> (ø)
pallets/creditcoin/src/test_utils.rs	100.00% <100.00%> (ø)
pallets/creditcoin/src/tests.rs	98.20% <ø> (ø)
runtime/src/lib.rs	15.74% <100.00%> (-0.20%)	⬇️
runtime/src/version.rs	0.00% <ø> (ø)
pallets/creditcoin/src/lib.rs	87.18% <97.91%> (+1.85%)	⬆️
pallets/creditcoin/src/types.rs	83.00% <0.00%> (ø)
pallets/creditcoin/src/types/cleanup.rs	92.85% <92.85%> (ø)
pallets/creditcoin/src/tests/cleanup.rs	97.80% <97.80%> (ø)

... and 11 files with indirect coverage changes

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[github-actions]

For full LLVM coverage report click here!