[flutter_migrate] Compute (#2734)

* Compute

* Licenses:

* Licenses for test

* Merge with depenencies

* Address comments p1

* Separate out logging from logic

* Refactor into smaller methods

* Improve logging and verbose usages

* Diferentiate merge skip vs total skip

* More docs

* Remove additional skip

* Fix custom merge tests

* Mocked environment

* Formatting

* TImeouts

* Use separate enum to address project directories including root

* tests passing

* Fix analyzer

* address comments, formatting

* Test robustness

* Fix update locks test

* formatting

* logging for CI test failures

* Canonicalize test paths

* Canonizalize both sides of tests

* Address comments, fix tests

* Formatting

* Gradle locks test

Author: GaryQian

packages/flutter_migrate/lib/src/base/project.dart

@@ -16,7 +16,6 @@ enum SupportedPlatform {
   web,
   windows,
   fuchsia,
-  root, // Special platform to represent the root project directory
 }
 
 class FlutterProjectFactory {
@@ -61,10 +60,8 @@ class FlutterProject {
   File get metadataFile => directory.childFile('.metadata');
 
   /// Returns a list of platform names that are supported by the project.
-  List<SupportedPlatform> getSupportedPlatforms({bool includeRoot = false}) {
-    final List<SupportedPlatform> platforms = includeRoot
-        ? <SupportedPlatform>[SupportedPlatform.root]
-        : <SupportedPlatform>[];
+  List<SupportedPlatform> getSupportedPlatforms() {
+    final List<SupportedPlatform> platforms = <SupportedPlatform>[];
     if (directory.childDirectory('android').existsSync()) {
       platforms.add(SupportedPlatform.android);
     }