Add a provisional section on pytest code style w.r.t. fixtures

[vshampor]

Changes

As stated in the title

Reason for changes

This doesn't seem obvious to some developers, so will state this in the style guide.

Related tickets

N/A

Tests

N/A

[alexsu52]

LGTM

[codecov]

Codecov Report

Merging #2220 (f943269) into develop (da16069) will increase coverage by 54.30%.
Report is 25 commits behind head on develop.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #2220       +/-   ##
============================================
+ Coverage    36.40%   90.71%   +54.30%     
============================================
  Files          486      485        -1     
  Lines        43469    43641      +172     
============================================
+ Hits         15827    39589    +23762     
+ Misses       27642     4052    -23590     

Flag	Coverage Δ
COMMON	15.74% <ø> (?)
ONNX	33.79% <ø> (?)
OPENVINO	38.56% <ø> (?)
TENSORFLOW	30.01% <ø> (?)
TORCH	62.68% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

see 354 files with indirect coverage changes