[MAINT] Update config for formatting of nilearn/datasets

[Remi-Gau]

Relates #2528

Splinter of #3624

Changes proposed in this pull request:

Changes proposed in this pull request:

• update files include in pre-commit config
• update files excluding in pre-commit
• update flake8 / isort CI

to be merged after:

• [MAINT] Format datasets tests #3689
• [MAINT] Format datasets tests atlas #3690
• [MAINT] Format datasets tests func #3691
• [MAINT] Format datasets tests func neurovault #3692
• [MAINT] Format datasets - small files  #3693
• [MAINT] Format datasets/atlas.py #3694
• [MAINT] Format datasets/func.py #3695
• [MAINT] Format datasets/neurovault.py #3696

[github-actions]

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[codecov]

Codecov Report

Merging #3697 (650068d) into main (51a651c) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #3697   +/-   ##
=======================================
  Coverage   91.57%   91.57%           
=======================================
  Files         139      139           
  Lines       16576    16576           
  Branches     3233     3233           
=======================================
  Hits        15179    15179           
  Misses       1394     1394           
  Partials        3        3           

Impacted Files	Coverage Δ
nilearn/datasets/_testing.py	96.31% <100.00%> (ø)

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[Remi-Gau]

closes #3624 as this is the last PR that it was split into.

[Remi-Gau]

will fix remaining flake8 issues in this PR: probably style regressions from other PR.

[ymzayek]

LGTM

[bthirion]

LGTM, but beware the MacOS failure.

[NicolasGensollen]

LGTM, thanks @Remi-Gau !

[Remi-Gau]

LGTM, but beware the MacOS failure.

Thanks for catching this one. @bthirion.
Seems unrelated. Need to check if this is not related to this flaky test I noticed a couple of months ago.

[Remi-Gau]

Reopened #3573 as the test failure on MacOS / Ptyhon 3.10 was the second occurrence of a flaky test.
But will merge as this is unrelated to this PR.

thanks @bthirion @ymzayek @NicolasGensollen for the reviews