Revert "Run Flutter framework tests against the web engine in Cirrus (flutter-team-archive#16343)"

This reverts commit 9d579ce.

Author: NoamDev

.cirrus.yml

@@ -1,24 +1,5 @@
 gcp_credentials: ENCRYPTED[987a78af29b91ce8489594c9ab3fec21845bbe5ba68294b8f6def3cf0d380830f06687a89ea69c87344c5ade369700fe]
 
-web_shard_template: &WEB_SHARD_TEMPLATE
-  only_if: "changesInclude('.cirrus.yml', 'lib/web_ui/**', 'web_sdk/**') || $CIRRUS_PR == ''"
-  environment:
-    # As of October 2019, the Web shards needed more than 6G of RAM.
-    CPU: 2
-    MEMORY: 8G
-  compile_host_script: |
-    cd $ENGINE_PATH/src
-    ./flutter/tools/gn --unoptimized --full-dart-sdk
-    ninja -C out/host_debug_unopt
-  fetch_framework_script: |
-    mkdir -p $FRAMEWORK_PATH
-    cd $FRAMEWORK_PATH
-    git clone https://github.com/flutter/flutter.git
-    cd flutter
-    bin/flutter update-packages --local-engine=host_debug_unopt
-  script:
-    - dart --enable-asserts $FRAMEWORK_PATH/flutter/dev/bots/test.dart --local-engine=host_debug_unopt
-
 # LINUX
 task:
   gke_container:
@@ -99,32 +80,6 @@ task:
       test_framework_script: |
         cd $FRAMEWORK_PATH/flutter/packages/flutter
         ../../bin/flutter test --local-engine=host_debug_unopt
-
-    # PLEASE KEEP THESE WEB TEST SHARDS IN SYNC WITH THEIR COUNTERPARTS IN flutter/flutter's CIRRUS CONFIG.
-    - name: web_tests-0-linux
-      << : *WEB_SHARD_TEMPLATE
-
-    - name: web_tests-1-linux
-      << : *WEB_SHARD_TEMPLATE
-
-    - name: web_tests-2-linux
-      << : *WEB_SHARD_TEMPLATE
-
-    - name: web_tests-3-linux
-      << : *WEB_SHARD_TEMPLATE
-
-    - name: web_tests-4-linux
-      << : *WEB_SHARD_TEMPLATE
-
-    - name: web_tests-5-linux
-      << : *WEB_SHARD_TEMPLATE
-
-    - name: web_tests-6-linux
-      << : *WEB_SHARD_TEMPLATE
-
-    - name: web_tests-7_last-linux # last Web shard must end with _last
-      << : *WEB_SHARD_TEMPLATE
-
     - name: build_and_test_web_linux_firefox
       compile_host_script: |
         cd $ENGINE_PATH/src