workflows: Merge LLVM tests together into a single job (llvm#78877) (llvm#79710)

This is possible now that the free GitHub runners for Windows and Linux
have more disk space:

https://github.blog/2024-01-17-github-hosted-runners-double-the-power-for-open-source/

I also had to switch from macOS-11 to macOS-13 in order to prevent the
job from timing out. macOS-13 runners have 4 vCPUs and the macOS-11
runners only have 3.

Author: tstellar

.github/workflows/llvm-project-tests.yml

@@ -14,7 +14,7 @@ on:
         required: false
       os_list:
         required: false
-        default: '["ubuntu-latest", "windows-2019", "macOS-11"]'
+        default: '["ubuntu-latest", "windows-2019", "macOS-13"]'
       python_version:
         required: false
         type: string

.github/workflows/llvm-tests.yml

@@ -27,31 +27,13 @@ concurrency:
   cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
 
 jobs:
-  check_all:
+  check-all:
     if: github.repository_owner == 'llvm'
-    name: Test llvm,clang,libclc
+    name: Build and Test
     uses: ./.github/workflows/llvm-project-tests.yml
     with:
       build_target: check-all
-      projects: clang;libclc
-
-  # These need to be separate from the check_all job, becuase there is not enough disk
-  # space to build all these projects on Windows.
-  build_lldb:
-    if: github.repository_owner == 'llvm'
-    name: Build lldb
-    uses: ./.github/workflows/llvm-project-tests.yml
-    with:
-      build_target: ''
-      projects: clang;lldb
-
-  check_lld:
-    if: github.repository_owner == 'llvm'
-    name: Test lld
-    uses: ./.github/workflows/llvm-project-tests.yml
-    with:
-      build_target: check-lld
-      projects: lld
+      projects: clang;lld;libclc;lldb
 
   abi-dump-setup:
     if: github.repository_owner == 'llvm'