[clang-tools-extra] [clang-tidy] Don't print `Enabled checks:` by default (PR #185229)

[Baranov Victor via cfe-commits]

vbvictor wrote:

I'm -1 on this change:
- You can use `-quiet` if don't want to look at verbose output
- I found it useful when integrating tidy in CI: if small number or none checks were enabled, it indicated that some configuration was wrong. Also, if there is only one `.clang-tidy` config for whole project, it's good to see which exact checks run.

--------------------------------

> not human readable at all

Could you elaborate on this? `-list-checks` option seems to me in human-readable format, test run:

```
C:\Users\Victor\repos\llvm-project>python3 clang-tools-extra/clang-tidy/tool/run-clang-tidy.py -p build clang-tools-extra/clang-tidy/
Enabled checks:
    llvm-else-after-return
    llvm-header-guard
    llvm-include-order
    llvm-namespace-comment
    llvm-prefer-isa-or-dyn-cast-in-conditionals
    llvm-prefer-register-over-unsigned
    llvm-qualified-auto
    llvm-twine-local
    misc-confusable-identifiers
    misc-coroutine-hostile-raii
    misc-definitions-in-headers
    misc-header-include-cycle
    misc-misleading-bidirectional
    misc-misleading-identifier
    misc-misplaced-const
    misc-new-delete-overloads
    misc-non-copyable-objects
    misc-redundant-expression
    misc-static-assert
    misc-throw-by-value-catch-by-reference
    misc-unconventional-assign-operator
    misc-uniqueptr-reset-release
    misc-unused-alias-decls
    misc-unused-using-decls
    misc-use-internal-linkage
    readability-identifier-naming
```

https://github.com/llvm/llvm-project/pull/185229