Revert accidental push to master, disallow this from happening again

[volokluev]

I added a test utility thinking it was on its own branch, it was not, I pushed out of muscle memory and nothing stopped me.

Now there is a pre-commit hook assuring you cannot commit onto master.

[codecov-commenter]

Codecov Report

Merging #2336 (e8ccf33) into master (4631aea) will increase coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2336      +/-   ##
==========================================
+ Coverage   92.66%   92.75%   +0.08%     
==========================================
  Files         560      559       -1     
  Lines       25818    25735      -83     
==========================================
- Hits        23924    23870      -54     
+ Misses       1894     1865      -29     

Impacted Files	Coverage Δ
tests/query/test_expressions.py	100.00% <100.00%> (ø)

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