ref(replacements): Move ProjectsQueryFlags out of errors_replacer

[rahul-kumar-saini]

Overview

• ProjectsQueryFlags is a huge class and concept, and although tied to the errors_replacer, it should probably reside in its own module and not errors_replacer.py
• Also, it seems strange that errors_replacer.py resides in the main snuba/datasets/ directory while the snuba/datasets/replacements/ directory is empty, and the replacer isn't a dataset
  • Moved errors_replacer.py into that directory and created a new file for ProjectsQueryFlags in the same directory

For context, ProjectsQueryFlags is the abstraction we use on top of Redis to handle setting and getting replacement data for projects.

[codecov-commenter]

Codecov Report

Base: 91.73% // Head: 21.71% // Decreases project coverage by -70.02% ⚠️

Coverage data is based on head (a1a7325) compared to base (06590b3).
Patch coverage: 30.28% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #3504       +/-   ##
===========================================
- Coverage   91.73%   21.71%   -70.03%     
===========================================
  Files         717      677       -40     
  Lines       33519    32189     -1330     
===========================================
- Hits        30750     6989    -23761     
- Misses       2769    25200    +22431     

Impacted Files	Coverage Δ
snuba/replacer.py	0.00% <0.00%> (-91.17%)	⬇️
tests/datasets/test_errors_replacer.py	0.00% <0.00%> (-99.62%)	⬇️
tests/test_replacer.py	0.00% <0.00%> (-97.20%)	⬇️
...nuba/datasets/replacements/projects_query_flags.py	32.78% <32.78%> (ø)
snuba/datasets/replacements/errors_replacer.py	33.15% <33.33%> (ø)
snuba/datasets/storages/errors.py	100.00% <100.00%> (ø)
snuba/query/processors/physical/replaced_groups.py	40.27% <100.00%> (-55.56%)	⬇️
tests/base.py	0.00% <0.00%> (-100.00%)	⬇️
tests/helpers.py	0.00% <0.00%> (-100.00%)	⬇️
tests/conftest.py	0.00% <0.00%> (-100.00%)	⬇️
... and 639 more

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