[GitHub][CI] Add clang-tidy premerge workflow (#154829) **KEY POINTS** - MVP workflow to automatically lint C++ files, located **only** in `clang-tools-extra/clang-tidy`. It's chosen this way as `clang-tools-extra/clang-tidy` is almost 100% `clang-tidy` complaint, thus we would automatically enforce a [high quality standard for clang-tidy source code](https://discourse.llvm.org/t/rfc-create-hardened-clang-tidy-config-for-clang-tidy-directory/87247). (https://github.com/llvm/llvm-project/pull/147793) - Implementation is very similar to code-format job, but without the ability to run `code-lint-helper.py` locally. **FOUND ISSUES** + open questions - Speed: it takes ~ 1m40sec to download and unpack `clang-tidy` plus additional ~4 mins to configure and CodeGen targets. I see that `premerge.yaml` runs on special `llvm-premerge-linux-runners` runners which can use `sccache` for speed. Can we use the same runners for this job? Exact timings can be found [here](https://github.com/llvm/llvm-project/actions/runs/17135749067/job/48611150680?pr=154223). **TO DO** - Place common components from `code-lint-helper.py` and `code-format-helper.py` into a separate file and reuse it in both CI's. - Compute CodeGen targets based on `projects_to_build`, for now `clang-tablegen-targets` is hardcoded for `clang-tools-extra/`. - Automatically generate and upload `.yaml` for `clang-apply-replacements` - Create an RFC with a plan how to enable `clang-tidy` in other projects so that Maintainers of LLVM components could choose if they want `clang-tidy` or not. - Add more linters like `pylint`, `ruff` in the future.
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