Don't add extra-prog-path to ~/.config/cabal/config (#8951) (backport #8952)

[mergify]

This is an automatic backport of pull request #8952 done by Mergify.
Cherry-pick of ea55955 has failed:

On branch mergify/bp/3.10/pr-8952
Your branch is up to date with 'origin/3.10'.

You are currently cherry-picking commit ea55955ed.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   cabal-install/tests/IntegrationTests2.hs
	modified:   cabal-install/tests/IntegrationTests2/config/default-config
	new file:   changelog.d/issue-8951

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   cabal-install/src/Distribution/Client/Config.hs

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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[Kleidukos]

@Mergifyio squash

[mergify]

squash

✅ Pull request squashed successfully