Backport #10548: Print info about current project file in use to stderr and ignore the imports by default

[mergify]

fix #10547 by printing the project config info to stderr.

Also, report only top-level project configs with the default verbosity. Otherwise, imported config files can still be seen in the verbose mode.

Manual Q/A

Try to reproduce #10547

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Template Α: This PR modifies behaviour or interface

Include the following checklist in your PR:

• Patches conform to the coding conventions.
• [N/A] This fixes code that has not been released yet. Any changes that could be relevant to users have been recorded in the changelog.
  • NO Is the change significant? If so, remember to add significance: significant in the changelog file.
• [N/A] The documentation has been updated, if necessary.
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This is an automatic backport of pull request #10548 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 7de199a has failed:

On branch mergify/bp/3.14/pr-10548
Your branch is up to date with 'origin/3.14'.

You are currently cherry-picking commit 7de199ad5.
  (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-solver/src/Distribution/Solver/Types/ProjectConfigPath.hs
	modified:   cabal-install/src/Distribution/Client/ProjectConfig.hs
	modified:   cabal-install/src/Distribution/Client/ProjectPlanning.hs
	modified:   cabal-testsuite/PackageTests/NewConfigure/LocalConfigOverwrite/cabal.out
	modified:   cabal-testsuite/PackageTests/NewFreeze/BuildTools/new_freeze.out
	modified:   cabal-testsuite/PackageTests/NewFreeze/Flags/new_freeze.out
	modified:   cabal-testsuite/PackageTests/NewFreeze/FreezeFile/new_freeze.out
	modified:   cabal-testsuite/PackageTests/RelativePathProjectImports/cabal.out
	modified:   cabal-testsuite/PackageTests/VersionPriority/1-local.out
	modified:   cabal-testsuite/PackageTests/VersionPriority/1-web.out
	modified:   cabal-testsuite/PackageTests/VersionPriority/2-local.out
	modified:   cabal-testsuite/PackageTests/VersionPriority/2-web.out
	modified:   cabal-testsuite/PackageTests/VersionPriority/3-web.out

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   cabal-testsuite/PackageTests/ConditionalAndImport/cabal.out

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

[ulysses4ever]

If anyone wants to try to fix up the test, I'd appreciate that since I'm traveling during this week.