chore: Configure pre-commit for excluding files through black

[progmatic-99]

Fixes #7097

Short description of what this resolves:

I hard-coded the files/folders that needs to be excluded in the pre-commit config file. Now, when you run black -v . black ignores the excluded folders/files.

[codecov]

Codecov Report

Merging #7323 into development will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           development    #7323   +/-   ##
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  Coverage        64.09%   64.09%           
============================================
  Files              259      259           
  Lines            13102    13102           
============================================
  Hits              8398     8398           
  Misses            4704     4704           

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[iamareebjamal]

Ideally it should read the config. Any doc mentioning this is how it should be configured?

[progmatic-99]

https://pre-commit.com/#pre-commit-configyaml---hooks
So, this answer helps a lot as to why we should do it this way, because of the way black works.
This comment also says to use this way to exclude/include files.
As to why black doesn't see the config when run through pre-commit, this issue says that it's consistent behaviour.
The docs or readme doesn't have any reference on why we should do it this way.

[iamareebjamal]

This

open-event-server/pyproject.toml

Lines 1 to 24 in c4a9bb4

	[tool.black]
	line-length = 90
	target-version = ['py37']
	skip-string-normalization = true
	exclude = '''
	(
	/(
	\.eggs # exclude a few common directories in the
	| \.git # root of the project
	| \.hg
	| \.mypy_cache
	| \.tox
	| \.venv
	| _build
	| buck-out
	| build
	| dist
	| migrations
	)/
	| foo.py # also separately exclude a file named foo.py in
	# the root of the project
	)
	'''

[progmatic-99]

@iamareebjamal i edited my comment, please review

[iamareebjamal]

Thank You