Add deleted_branch table fixture

[lafriks]

As title

[Morlinest]

Why we need this "empty" file?

[lafriks]

@Morlinest to reset table to empty (delete all rows) between tests, otherwise anything that gets inserted there stays between tests that can result in failures or unexpected behaviour.

[Morlinest]

@lafriks OK, that makes sense.

[lunny]

LGTM

[lunny]

CI failed.

[lafriks]

@lunny Tests where abusing that deleted branches table was not cleared between tests so I had to fix them :)

[Morlinest]

LGTM

[codecov-io]

Codecov Report

Merging #2832 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2832   +/-   ##
=======================================
  Coverage   26.85%   26.85%           
=======================================
  Files          89       89           
  Lines       17607    17607           
=======================================
  Hits         4728     4728           
  Misses      12193    12193           
  Partials      686      686

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