Don't reload action.Repo when it has been loaded

[lunny]

Improvement for #19598

[zeripath]

hmm... I think we might be better off changing the SELECT so as to not extract any of the repo fields from the db in the first place: There's likely to be a duplication of a lot of repo data this could cause a significant increase in memory use.

(TBH we should be extracting the last update time from the repo and using caching to get a copy of the latest version.)

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (main@d483407). Click here to learn what that means.
The diff coverage is 91.66%.

@@           Coverage Diff           @@
##             main   #19632   +/-   ##
=======================================
  Coverage        ?   47.36%           
=======================================
  Files           ?      957           
  Lines           ?   133415           
  Branches        ?        0           
=======================================
  Hits            ?    63196           
  Misses          ?    62587           
  Partials        ?     7632           

Impacted Files	Coverage Δ
models/action.go	49.24% <85.71%> (ø)
models/action_list.go	64.00% <100.00%> (ø)

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