⚡️ Add `ssh://git@github.com/flutter/flutter.git` as a standard remote (#131333)

Resolves #98020.

packages/flutter_tools/lib/src/version.dart

@@ -689,6 +689,7 @@ class VersionUpstreamValidator {
   static final List<String> _standardRemotes = <String>[
     'https://github.com/flutter/flutter.git',
     'git@github.com:flutter/flutter.git',
+    'ssh://git@github.com/flutter/flutter.git',
   ];
 
   // Strips ".git" suffix from a given string, preferably an url.

packages/flutter_tools/test/general.shard/version_test.dart

@@ -325,6 +325,7 @@ void main() {
       const String flutterStandardUrlDotGit = 'https://github.com/flutter/flutter.git';
       const String flutterNonStandardUrlDotGit = 'https://githubmirror.com/flutter/flutter.git';
       const String flutterStandardSshUrlDotGit = 'git@github.com:flutter/flutter.git';
+      const String flutterFullSshUrlDotGit = 'ssh://git@github.com/flutter/flutter.git';
 
       VersionCheckError? runUpstreamValidator({
         String? versionUpstreamUrl,
@@ -394,6 +395,10 @@ void main() {
         expect(runUpstreamValidator(versionUpstreamUrl: flutterStandardSshUrlDotGit), isNull);
       });
 
+      testWithoutContext('does not return error at full ssh url with FLUTTER_GIT_URL unset', () {
+        expect(runUpstreamValidator(versionUpstreamUrl: flutterFullSshUrlDotGit), isNull);
+      });
+
       testWithoutContext('stripDotGit removes ".git" suffix if any', () {
         expect(VersionUpstreamValidator.stripDotGit('https://github.com/flutter/flutter.git'), 'https://github.com/flutter/flutter');
         expect(VersionUpstreamValidator.stripDotGit('https://github.com/flutter/flutter'), 'https://github.com/flutter/flutter');