This reverts commit 5fd259be.

* Revert "Enable dart_plugin_registry_test (#76645)"

This reverts commit 109e0bb9.

* Revert "Apply changes caused by https://github.com/flutter/flutter/pull/76662 (#77093)"

This reverts commit cdca6485.

* Revert "Disable clang format in the plugin registrants (#76662)"

This reverts commit dadbd47d.

* Revert "Disable warnings for the dart plugin registrant (#76561)"

This reverts commit 098ece52.

* Revert "Remove dart_plugin_registry_test timeouts (#76838)"

This reverts commit 1610a274.

* Revert "Implement dartPluginClass support for plugins (#74469)"

This reverts commit b7d48062.

Kick.

[flutter_tools] replace MockFlutterVersion usage with fake where possible, move from context (#77390)

* opt out the flutter tool

* oops EOF

* fix import

* Update tool_backend.dart

* Update daemon_client.dart

* fix more

This reverts commit ae06c19a.

When the developer doesn't have permission to create symlinks, we
display specific instructions, but they were only correct for recent
versions of Windows 10. This improves them by:
- Giving the correct instructions for older versions.
- For recent versions, adds a command that will deep-link into the
  settings application so that developers don't have to figure out
  where/how to enable developer mode.

Fixes https://github.com/flutter/flutter/issues/66973

The Windows plugin CMake generation had code to ensure that the paths
written to it used POSIX separators, but the Linux version didn't; that
meant that plugin updates run on Windows machines would corrupt the
generated (but checked in) Linux CMake file.

This change shares that code so that both will use POSIX paths
regardless of what OS they are generated on.

Fixes https://github.com/flutter/flutter/issues/64591