[clang-tools-extra] [IncludeCleaner] display overview (PR #93932)

[Aaron Ballman via cfe-commits]

AaronBallman wrote:

> @zeyi2 @AaronBallman @kadircet @sam-mccall @kazutakahirata I'm coming back to revive this PR again after 2 years. Rebased on the latest main branch AND the formatting is changed per the bot suggested. Now the CI requires your approval again.
> 
> Hope this time this can be merged before the upstream changes drastically again...

Thank you for pinging this, sorry for dropping the ball!

Changes LGTM, so enabling auto-merge; should land once CI comes back green.

https://github.com/llvm/llvm-project/pull/93932