[MAINT] use tmp_path in tests for first lvl GLM

[Remi-Gau]

• relates to improve handling of temporary files during testing #3726
• extracted from [WIP] rely more on tmp_path in testing Do Not REVIEW  #3891
• blocked by [MAINT] add file path param to write fake fmri data #3892

[github-actions]

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[bthirion]

LMK when it deserves a review.

[Remi-Gau]

LMK when it deserves a review.

not before #3892 is in because this PR depends on it

[codecov]

Codecov Report

Merging #3894 (8b56003) into main (d4fec68) will decrease coverage by 0.07%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #3894      +/-   ##
==========================================
- Coverage   91.60%   91.53%   -0.07%     
==========================================
  Files         134      134              
  Lines       15751    15751              
  Branches     3281     3281              
==========================================
- Hits        14429    14418      -11     
- Misses        772      784      +12     
+ Partials      550      549       -1     

Flag	Coverage Δ
macos-latest_3.10	91.53% <ø> (ø)
macos-latest_3.11	91.53% <ø> (ø)
macos-latest_3.8	91.49% <ø> (ø)
macos-latest_3.9	91.49% <ø> (ø)
ubuntu-latest_3.10	91.53% <ø> (ø)
ubuntu-latest_3.11	91.53% <ø> (ø)
ubuntu-latest_3.8	91.49% <ø> (ø)
ubuntu-latest_3.9	91.49% <ø> (ø)
windows-latest_3.10	91.47% <ø> (ø)
windows-latest_3.11	91.47% <ø> (ø)
windows-latest_3.8	91.43% <ø> (ø)
windows-latest_3.9	91.43% <ø> (ø)

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[ymzayek]

Thx @Remi-Gau

[Remi-Gau]

Thanks @ymzayek