These tests will hit the real Cache, failing if the flutter root has been modified

First pass at fixing #57985 and implementing #59602

This doesn't have enough metadata to be useful for IDEs yet, but it prevents the issue from getting worse while we iterate on it.

WebAssetServer could fail if some of the global statics it depended on were initialized in a different order. Fix this by removing globals.

Delete dwds startup test that needs to spawn a real server.

Remove the version checking and associated warnings. The Linux template
and build process will now be subject to more typical Flutter breaking
change policy, and should no longer require regularly deleting and
recreating the platform directory.

The vm_service_integration test flake is caused by trying to call the method before the framework is initialized (and the extension added). The run errors failure is caused by the error taking some time to propagate to the harness

* Add semantics sort key for modal scope and modal barrier

* fix test

* fix test

* fix test

* fix space

* fix more tests

* addressing comments

Fix tests broken under tester

Fixes additional bugs uncovered by tester, style fixes to prevent suggested imports.

Revert "[flutter_tools] separate target platform, host platform, and architecutre (#60119)" (#60147)

This reverts commit 30d97d89.

Update all versions, specifically file which fixes some bugs that caused tests to fail if run in different orders:

- systemTemp directories created by MemoryFileSystem will allot names based on the file system instance instead of globally.
- MemoryFile.readAsLines()/readAsLinesSync() no longer treat a final newline in the file as the start of a new, empty line.
- RecordingFile.readAsLine()/readAsLinesSync() now always record a final newline.

Use Dart's characters package to fix user-facing grapheme cluster bugs.

separate target platform, host platform, and architecture