DB: Remove AtomicContextWithRetryClearFn, rename to AtomicContext

[cce]

Summary

This implements some PR feedback from @gmalouf in #6190 (comment) to remove an unnecessary extra function wrapper when using db.AtomicContext function

Test Plan

Existing tests should pass

[codecov]

Codecov Report

Attention: Patch coverage is 28.57143% with 5 lines in your changes missing coverage. Please review.

Project coverage is 51.84%. Comparing base (d52e3dd) to head (243bfd6).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...edger/store/trackerdb/sqlitedriver/sqlitedriver.go	0.00%	5 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6231   +/-   ##
=======================================
  Coverage   51.84%   51.84%           
=======================================
  Files         643      643           
  Lines       86384    86382    -2     
=======================================
+ Hits        44783    44787    +4     
+ Misses      38737    38729    -8     
- Partials     2864     2866    +2     

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