ci: fix mockgen generation time

[phm07]

Generating all mocks in one command instead of one command for each interface reduces the total time for go generate ./... from 20.50s to 3.16s (on my system), -> ~85% improvement

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.43%. Comparing base (7756f5d) to head (529964b).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1337   +/-   ##
=======================================
  Coverage   72.43%   72.43%           
=======================================
  Files         301      301           
  Lines       11005    11005           
=======================================
  Hits         7972     7972           
  Misses       2144     2144           
  Partials      889      889           

Flag	Coverage Δ
e2e	51.49% <ø> (ø)
unit	67.45% <ø> (ø)

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[apricote]

The ci/generate job was reduced from 1m17s to 42s, so 45% quicker. I assume this is less than your local test because the setup time for the environment is constant.