Fix #8316: run fix-whitespace --check as CI workflow (backport #8320)

[mergify]

This is an automatic backport of pull request #8320 done by Mergify.
Cherry-pick of b1f59dd has failed:

On branch mergify/bp/3.8/pr-8320
Your branch is up to date with 'origin/3.8'.

You are currently cherry-picking commit b1f59dde5.
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Changes to be committed:
	modified:   .gitlab/ci.sh
	modified:   Cabal-syntax/src/Distribution/Backpack.hs
	modified:   Cabal-syntax/src/Distribution/Fields/Pretty.hs
	modified:   Cabal-syntax/src/Distribution/SPDX/LicenseExceptionId.hs
	modified:   Cabal-syntax/src/Distribution/SPDX/LicenseId.hs
	modified:   Cabal-syntax/src/Distribution/Types/CondTree.hs
	modified:   Cabal-syntax/src/Distribution/Types/ExeDependency.hs
	modified:   Cabal-syntax/src/Distribution/Types/LibraryName.hs
	modified:   Cabal-syntax/src/Distribution/Types/Mixin.hs
	modified:   Cabal-syntax/src/Distribution/Types/PkgconfigVersion.hs
	modified:   Cabal-syntax/src/Distribution/Utils/Generic.hs
	modified:   Cabal-tests/tests/ParserTests/errors/leading-comma-2c.cabal
	modified:   Cabal-tests/tests/ParserTests/regressions/cc-options-with-optimization.cabal
	modified:   Cabal-tests/tests/ParserTests/regressions/cxx-options-with-optimization.cabal
	modified:   Cabal-tests/tests/ParserTests/regressions/hasktorch.cabal
	modified:   Cabal-tests/tests/ParserTests/regressions/issue-7776-a.cabal
	modified:   Cabal-tests/tests/UnitTests/Distribution/Simple/Command.hs
	modified:   Cabal-tests/tests/cbits/rpmvercmp.c
	modified:   Cabal-tests/tests/hackage/check.sh
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	modified:   Cabal-tests/tests/misc/ghc-supported-languages.hs
	modified:   Cabal/src/Distribution/ReadE.hs
	modified:   Cabal/src/Distribution/Simple/Program/ResponseFile.hs
	modified:   bootstrap/README.md
	modified:   bootstrap/src/Main.hs
	modified:   buildinfo-reference-generator/template.zinza
	modified:   cabal-dev-scripts/src/GenCabalInstallCabal.hs
	modified:   cabal-dev-scripts/src/GenUtils.hs
	modified:   cabal-install/src/Distribution/Client/BuildReports/Anonymous.hs
	modified:   cabal-install/src/Distribution/Client/CmdBench.hs
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	modified:   cabal-install/src/Distribution/Deprecated/ViewAsFieldDescr.hs
	modified:   cabal-install/tests/IntegrationTests2/build/ignore-project/a.cabal
	modified:   cabal-install/tests/IntegrationTests2/targets/simple/p.cabal
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	modified:   cabal-testsuite/PackageTests/NewBuild/T3460/sub-package-B/sub-package-B.cabal
	modified:   cabal-testsuite/PackageTests/Regression/T5213/cabal.test.hs
	modified:   cabal-testsuite/PackageTests/Regression/T5213ExeCoverage/cabal.test.hs
	modified:   cabal-testsuite/PackageTests/Regression/T5309/T5309.cabal
	modified:   cabal-testsuite/PackageTests/Regression/T5309/lib/Bio/Character/Exportable/Class.hs
	modified:   cabal-testsuite/PackageTests/Regression/T5782Diamond/issue5782/Main.hs
	modified:   cabal-testsuite/PackageTests/ShowBuildInfo/Custom/custom.test.hs
	modified:   cabal-testsuite/PackageTests/TestCodeGenerator/test-code-gen/LICENSE
	modified:   cabal-testsuite/PackageTests/TestCodeGenerator/test-code-gen/app/Main.hs
	modified:   cabal-testsuite/PackageTests/postCheckoutCommand/cabal.test.hs
	modified:   doc/README.md
	modified:   generics-sop-lens.hs
	modified:   license-list-data/exceptions-3.0.json
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	modified:   release-notes/Cabal-3.4.0.0.md
	modified:   release-notes/Cabal-3.8.1.0.md
	modified:   release-notes/cabal-install-3.4.0.0.md
	modified:   solver-benchmarks/HackageBenchmark.hs
	modified:   templates/SPDX.LicenseExceptionId.template.hs
	modified:   templates/SPDX.LicenseId.template.hs

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	both modified:   Cabal/src/Distribution/Simple/Haddock.hs
	deleted by us:   cabal-install/src/Distribution/Client/CmdHaddockProject.hs
	both modified:   doc/cabal-project.rst

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[ulysses4ever]

Conflicts... that's too bad.

[ulysses4ever]

That's too combersome. The easier path is to not to include whitespace job in the backports. See #8514.

[Mikolaj]

Makes sense. Currently Whitespace CI job is not mandatory for 3.* branches. Let's stick to it until the next release.