fix(worker): Match accession number only for dataset maintenance tasks

[nellh]

Avoid running maintenance tasks on temporary backups or other files that may include the dataset name.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.43%. Comparing base (ca93267) to head (64689e2).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3530   +/-   ##
=======================================
  Coverage   48.43%   48.43%           
=======================================
  Files         597      597           
  Lines       42255    42256    +1     
  Branches     1391     1391           
=======================================
+ Hits        20467    20468    +1     
  Misses      21619    21619           
  Partials      169      169           

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