Don't print SQL in unit tests

[ethantkoenig]

Currently, all SQL commands, from all tests, are printed to stdout (or maybe stderr?) when a unit test fails. This is too much output (thousands of lines) to be helpful as the default; you have to scroll through a bunch of unrelated output just to see which test failed.

Now, output will only be printed if the environment variable $GITEA_UNIT_TESTS_VERBOSE is set to true.

[codecov-io]

Codecov Report

Merging #2995 into master will decrease coverage by 0.01%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master    #2995      +/-   ##
==========================================
- Coverage   32.54%   32.53%   -0.02%     
==========================================
  Files         267      267              
  Lines       39270    39271       +1     
==========================================
- Hits        12779    12775       -4     
- Misses      24698    24702       +4     
- Partials     1793     1794       +1

Impacted Files	Coverage Δ
models/unit_tests.go	87.5% <33.33%> (-2.98%)	⬇️
modules/process/manager.go	76.81% <0%> (-4.35%)	⬇️

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[lafriks]

LGTM

[techknowlogick]

LGTM

[lunny]

How about add an environment to enable that? Sometimes we need to know where is the error.

[ethantkoenig]

@lunny Done