[libclc] [llvm] [runtimes] Aggregate per-target runtime checks in top-level check-${runtime_name} (PR #191743)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `cross-project-tests-sie-ubuntu-dwarf5` running on `doug-worker-1b` while building `.ci,libclc,llvm` at step 2 "checkout".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/163/builds/38336

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 2 (checkout) failure: update (failure)
git version 2.34.1
fatal: unable to access 'https://github.com/llvm/llvm-project.git/': Could not resolve host: github.com
fatal: unable to access 'https://github.com/llvm/llvm-project.git/': Could not resolve host: github.com

```

</details>

https://github.com/llvm/llvm-project/pull/191743