Remove 3 semi-redundant try-jobs (#10786)

This is a subset of https://github.com/flutter/engine/pull/10485.
Hopefully this doesn't significantly reduce our coverage since we
have now limited the fuchsia auto-roller frequency.

.cirrus.yml

@@ -46,22 +46,6 @@ task:
       test_framework_script: |
         cd $FRAMEWORK_PATH/flutter/packages/flutter
         ../../bin/flutter test --local-engine=host_debug_unopt
-    - name: build_and_test_linux_opt_profile
-      compile_host_script: |
-        cd $ENGINE_PATH/src
-        ./flutter/tools/gn --runtime-mode profile --no-lto
-        ninja -C out/host_profile
-      test_host_script: |
-        cd $ENGINE_PATH/src
-        ./flutter/testing/run_tests.sh host_profile
-    - name: build_and_test_linux_opt_release
-      compile_host_script: |
-        cd $ENGINE_PATH/src
-        ./flutter/tools/gn --runtime-mode release --no-lto
-        ninja -C out/host_release
-      test_host_script: |
-        cd $ENGINE_PATH/src
-        ./flutter/testing/run_tests.sh host_release
     - name: build_and_test_android_unopt_debug
       env:
         USE_ANDROID: "True"
@@ -105,10 +89,8 @@ task:
       build_script: |
         cd $ENGINE_PATH/src/flutter
         ./ci/build.sh
-    - name: build_fuchsia_artifacts
-      compile_host_script: |
+      compile_fuchsia_script: |
         cd $ENGINE_PATH/src
-        rm -rf out
         ./flutter/tools/fuchsia/build_fuchsia_artifacts.py --engine-version HEAD --runtime-mode debug
 
 # WINDOWS