worker: add fetch-std for fetch match Go release versions

[visualfc]

worker /populate-stdlib is fetch all versions for Go standard libray and too slow.
add /fetch-std/ for fetch a version for match versions from the Go standard library into the tasks queue to be processed and inserted into the database. and skip all -beta and -rc version.
/fetch-std/v1.22 match to [v1.22.0 v1.22.1 v1.22.2].
/fetch-std/v1.22.1 match [v1.22.1]

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.85%. Comparing base (d0ceafc) to head (3a40387).
Report is 1 commits behind head on goplus.

Additional details and impacted files

@@           Coverage Diff           @@
##           goplus      #17   +/-   ##
=======================================
  Coverage   55.85%   55.85%           
=======================================
  Files         161      161           
  Lines       16210    16210           
=======================================
  Hits         9054     9054           
  Misses       6332     6332           
  Partials      824      824           

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