[INFRA] move validation of citation.cff in doc build workflow

[Remi-Gau]

Closes #3822

Changes proposed in this pull request:

• move content of citation.cff validation in the doc build workflow
• only run doc build if citation file is valid

[github-actions]

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[codecov]

Codecov Report

Merging #3823 (442c5f3) into main (bce754b) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #3823      +/-   ##
==========================================
- Coverage   91.53%   91.51%   -0.02%     
==========================================
  Files         133      133              
  Lines       15601    15599       -2     
  Branches     3247     2984     -263     
==========================================
- Hits        14280    14276       -4     
  Misses        774      774              
- Partials      547      549       +2     

Flag	Coverage Δ
macos-latest_3.10	?
macos-latest_3.11	?
macos-latest_3.8	?
macos-latest_3.9	?
ubuntu-latest_3.10	?
ubuntu-latest_3.8	91.42% <ø> (ø)
windows-latest_3.10	?
windows-latest_3.11	?
windows-latest_3.8	?
windows-latest_3.9	91.36% <ø> (ø)

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see 4 files with indirect coverage changes

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[bthirion]

LGTM, thx.