[wasm] Use docker images with emscripten 3.1.30 (#84014)

Currently the webassembly docker images with name ending with net8 have
emscripten 3.1.34 and break wasm builds on CI.

Author: radekdoulik

eng/pipelines/common/templates/pipeline-with-resources.yml

@@ -60,10 +60,10 @@ resources:
         ROOTFS_DIR: /crossrootfs/ppc64le
 
     - container: browser_wasm
-      image: mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-18.04-webassembly-net8
+      image: mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-18.04-webassembly-net8-20230322221728-80fdceb
 
     - container: wasi_wasm
-      image: mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-20.04-webassembly-net8
+      image: mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-20.04-webassembly-net8-20230322221804-80fdceb
 
     - container: freebsd_x64
       image: mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-18.04-cross-freebsd-12

eng/pipelines/libraries/helix-queues-setup.yml

@@ -201,6 +201,6 @@ jobs:
 
     # Browser WebAssembly windows
     - ${{ if in(parameters.platform, 'browser_wasm_win', 'wasi_wasm_win') }}:
-      - (Windows.Amd64.Server2022.Open)[email protected]/dotnet-buildtools/prereqs:windowsservercore-ltsc2022-helix-webassembly-net8
+      - (Windows.Amd64.Server2022.Open)[email protected]/dotnet-buildtools/prereqs:windowsservercore-ltsc2022-helix-webassembly-net8-20230319084205-80fdceb
 
     ${{ insert }}: ${{ parameters.jobParameters }}