[Autobackout][FunctionalRegression]Revert of change: e3906b1: Update …

…build-IGC public action

- Add LLVM 16
    - Remove 22.04 Ubuntu building; for public validate only on latest Ubuntu
    - Remove unused `experimental` key
    - Update SPIRV-Headers/Tools refs to use ToT

.github/workflows/build-IGC.yml

@@ -49,9 +49,12 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ubuntu_version: [ '24.04' ]
-        llvm_ver: [ 14, 15, 16 ]
-
+        ubuntu_version: [ '22.04', '24.04' ]
+        llvm_ver: [ 14 ]
+        include:
+          - ubuntu_version: '22.04'
+            llvm_ver: 15
+            experimental: true
     steps:
       - uses: actions/checkout@v3
       - name: cloning SPIRV-LLVM-Translator repository
@@ -96,9 +99,14 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ubuntu_version: [ '24.04' ]
-        llvm_ver: [ 14, 15, 16 ]
+        ubuntu_version: [ '22.04', '24.04' ]
+        llvm_ver: [ 14 ]
         compiler: [ gcc, clang ]
+        include:
+          - ubuntu_version: '22.04'
+            llvm_ver: 15
+            compiler: gcc
+            experimental: true
     steps:
       - uses: actions/checkout@v3
 
@@ -149,13 +157,13 @@ jobs:
         uses: actions/checkout@v3
         with:
           repository: KhronosGroup/SPIRV-Headers
-          ref: main
+          ref: sdk-1.3.204.1
           path: workspace/SPIRV-Headers
       - name:  Checkout the SPIRV-Headers
         uses: actions/checkout@v3
         with:
           repository: KhronosGroup/SPIRV-Tools
-          ref: main
+          ref: sdk-1.3.204.1
           path: workspace/SPIRV-Tools
       - name: get short hash
         id: igc-current-short-Hash