* opt out the flutter tool

* oops EOF

* fix import

* Update tool_backend.dart

* Update daemon_client.dart

* fix more

This reverts commit ae06c19a.

This PR will update IntelliJ IDEA/Community validation logic for 2020.1 and later on Linux and Windows.

[flutter_tools] remove globals from IntelliJ validator, refactor tests to remove dependency on JAR (#67240)

Move the intellij validator to its own file, and split off the tests. Remove globals from each, and remove dependency on a real jar/filesystem by creating a minimal version of the manifest xml and setting it up in the memory file system.

#47161