add api endpoint to remove retirevals

[coryschwartz]

fixes: #8414

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Checklist

Before you mark the PR ready for review, please make sure that:

• All commits have a clear commit message.
• The PR title is in the form of of <PR type>: <area>: <change being made>
  • example: fix: mempool: Introduce a cache for valid signatures
  • PR type: fix, feat, INTERFACE BREAKING CHANGE, CONSENSUS BREAKING, build, chore, ci, docs,perf, refactor, revert, style, test
  • area: api, chain, state, vm, data transfer, market, mempool, message, block production, multisig, networking, paychan, proving, sealing, wallet, deps
• This PR has tests for new functionality or change in behaviour
• If new user-facing features are introduced, clear usage guidelines and / or documentation updates should be included in https://lotus.filecoin.io or Discussion Tutorials.
• CI is green

[rjan90]

Closing as outdated.

[codecov]

Codecov Report

Attention: Patch coverage is 41.66667% with 14 lines in your changes missing coverage. Please review.

Project coverage is 40.28%. Comparing base (88f8c7d) to head (bac5f7d).
Report is 5980 commits behind head on master.

Files with missing lines	Patch %	Lines
node/impl/client/client.go	41.66%	13 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8525      +/-   ##
==========================================
- Coverage   40.86%   40.28%   -0.59%     
==========================================
  Files         686      521     -165     
  Lines       75710    56438   -19272     
==========================================
- Hits        30939    22735    -8204     
+ Misses      39445    29732    -9713     
+ Partials     5326     3971    -1355     

Files with missing lines	Coverage Δ
api/api_full.go	47.36% <ø> (-10.53%)	⬇️
node/impl/client/client.go	25.66% <41.66%> (-25.99%)	⬇️

... and 384 files with indirect coverage changes