Remove linux_host_release_tests. (#19419)

This set of tests is already running on LUCI.

Bug:
  https://github.com/flutter/flutter/issues/60607

.cirrus.yml

@@ -69,14 +69,6 @@ task:
         dart bin/parse_and_send.dart ../../../out/host_release/fml_benchmarks.json
         dart bin/parse_and_send.dart ../../../out/host_release/shell_benchmarks.json
         dart bin/parse_and_send.dart ../../../out/host_release/ui_benchmarks.json
-    - name: build_and_test_linux_release
-      compile_host_script: |
-        cd $ENGINE_PATH/src
-        ./flutter/tools/gn --runtime-mode=release
-        ninja -C out/host_release
-      test_host_script: |
-        cd $ENGINE_PATH/src
-        ./flutter/testing/run_tests.sh host_release
 
     # The following test depends on Flutter framework repo. It may fail if the
     # framework repo is currently broken.