Backport #10719: Follow HLint suggestion: use fewer imports

[mergify]

See #9110. The HLint "use fewer imports" suggestion was too much trouble to enable before most of the base CPP conditionals, "base 4.13 and older", were removed in #10092.

We're using fourmolu but this doesn't merge multiple imports from the same module.

The removal of MIN_VERSION_base(4,11,0) is permitted by #8998 (comment) and #8998 (comment).

Two files used for our tests taken from other projects are now ignored for linting, in .hlint.yaml:

 - arguments:
+    - --ignore-glob=Cabal-tests/tests/custom-setup/CabalDoctestSetup.hs
+    - --ignore-glob=Cabal-tests/tests/custom-setup/IdrisSetup.hs

The first of these, CabalDoctestSetup.hs, was mentioned by @Kleidukos in #8998 (comment).

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Template B: This PR does not modify behaviour or interface

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This is an automatic backport of pull request #10719 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 217f08a has failed:

On branch mergify/bp/3.14/pr-10719
Your branch is ahead of 'origin/3.14' by 1 commit.
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You are currently cherry-picking commit 217f08ac5.
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Changes to be committed:
	modified:   Cabal/src/Distribution/Compat/Internal/TempFile.hs
	modified:   Cabal/src/Distribution/Compat/Time.hs
	modified:   Cabal/src/Distribution/Simple/GHC.hs
	modified:   cabal-install/src/Distribution/Client/CmdTest.hs
	modified:   cabal-install/src/Distribution/Client/Config.hs
	modified:   cabal-install/src/Distribution/Client/ProjectPlanning.hs
	modified:   cabal-install/src/Distribution/Client/SetupWrapper.hs
	modified:   cabal-install/src/Distribution/Client/Store.hs

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	both modified:   .hlint.yaml
	both modified:   cabal-install/tests/IntegrationTests2.hs
	deleted by us:   cabal-testsuite/src/Test/Cabal/NeedleHaystack.hs

Cherry-pick of d165dfd has failed:

On branch mergify/bp/3.14/pr-10719
Your branch is ahead of 'origin/3.14' by 2 commits.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit d165dfda4.
  (fix conflicts and run "git cherry-pick --continue")
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Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   .hlint.yaml

no changes added to commit (use "git add" and/or "git commit -a")

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