Manually roll Flutter Engine from 0c41b02cd5a6 to c641f6307f08 (#127514)

Rolls engine to head with
[fixes](https://github.com/flutter/flutter/pull/127505) corresponding to
the [latest Dart roll](https://github.com/flutter/engine/pull/42286).

bin/internal/engine.version

-0c41b02cd5a641e42328403ed5a6e183c473c827
+c641f6307f08c43d45a73aa31ddeb052bc409cd0

bin/internal/fuchsia-linux.version

--dXJ_pnUVwmjscIYm42_OE80nLeouKgHGRsqBD2JoFoC
+UYN_Tk7M6_5d2aGIj7a2ozqAEmu8IRjI2H2DFuvNRcIC

bin/internal/fuchsia-mac.version

-aAjEDVse7qfMt0NqE-x2K0y-JIcvU2XLT8vjCHu2QOsC
+qoLy9E5PjnAlICjUbXiXkASNZSrgFBRRsZBVTFpuVB8C

dev/bots/test/analyze-snippet-code-test-input/known_broken_documentation.dart

@@ -144,8 +144,7 @@
 /// ```
 ///
 /// ```dart
-/// import 'dart:io'; // error (unused_import)
-/// final Widget p = Placeholder(); // error (undefined_class, undefined_function, avoid_dynamic_calls)
+/// import 'dart:io'; // error (unused_import)/// final Widget p = Placeholder(); // error (undefined_class, undefined_function)
 /// ```
 ///
 /// ```dart

dev/bots/test/analyze_snippet_code_test.dart

@@ -20,13 +20,10 @@ const List<String> expectedMainErrors = <String>[
   'dev/bots/test/analyze-snippet-code-test-input/known_broken_documentation.dart:134:14: (top-level declaration) (undefined_identifier)',
   'dev/bots/test/analyze-snippet-code-test-input/known_broken_documentation.dart:136:21: (top-level declaration) (read_potentially_unassigned_final)',
   'dev/bots/test/analyze-snippet-code-test-input/known_broken_documentation.dart:147:12: (self-contained program) (unused_import)',
-  'dev/bots/test/analyze-snippet-code-test-input/known_broken_documentation.dart:148:11: (self-contained program) (undefined_class)',
-  'dev/bots/test/analyze-snippet-code-test-input/known_broken_documentation.dart:148:22: (self-contained program) (avoid_dynamic_calls)',
-  'dev/bots/test/analyze-snippet-code-test-input/known_broken_documentation.dart:148:22: (self-contained program) (undefined_function)',
-  'dev/bots/test/analyze-snippet-code-test-input/known_broken_documentation.dart:153:10: (stateful widget) (annotate_overrides)',
-  'dev/bots/test/analyze-snippet-code-test-input/known_broken_documentation.dart:153:10: (stateful widget) (must_call_super)',
-  'dev/bots/test/analyze-snippet-code-test-input/known_broken_documentation.dart:161:7: (top-level declaration) (undefined_identifier)',
-  'dev/bots/test/analyze-snippet-code-test-input/known_broken_documentation.dart:165: Found "```" in code but it did not match RegExp: pattern=^ */// *```dart\$ flags= so something is wrong. Line was: "/// ```"',
+  'dev/bots/test/analyze-snippet-code-test-input/known_broken_documentation.dart:152:10: (stateful widget) (annotate_overrides)',
+  'dev/bots/test/analyze-snippet-code-test-input/known_broken_documentation.dart:152:10: (stateful widget) (must_call_super)',
+  'dev/bots/test/analyze-snippet-code-test-input/known_broken_documentation.dart:160:7: (top-level declaration) (undefined_identifier)',
+  'dev/bots/test/analyze-snippet-code-test-input/known_broken_documentation.dart:164: Found "```" in code but it did not match RegExp: pattern=^ */// *```dart\$ flags= so something is wrong. Line was: "/// ```"',
   'dev/bots/test/analyze-snippet-code-test-input/short_but_still_broken.dart:9:12: (statement) (invalid_assignment)',
   'dev/bots/test/analyze-snippet-code-test-input/short_but_still_broken.dart:18:4: Empty ```dart block in snippet code.',
 ];
@@ -71,7 +68,7 @@ void main() {
     final List<String> stderrNoDescriptions = stderrLines.map(removeLintDescriptions).toList();
     expect(stderrNoDescriptions, <String>[
       ...expectedMainErrors,
-      'Found 18 snippet code errors.',
+      'Found 15 snippet code errors.',
       'See the documentation at the top of dev/bots/analyze_snippet_code.dart for details.',
       '', // because we end with a newline, split gives us an extra blank line
     ]);
@@ -95,7 +92,7 @@ void main() {
     expect(stderrNoDescriptions, <String>[
       ...expectedUiErrors,
       ...expectedMainErrors,
-      'Found 22 snippet code errors.',
+      'Found 19 snippet code errors.',
       'See the documentation at the top of dev/bots/analyze_snippet_code.dart for details.',
       '', // because we end with a newline, split gives us an extra blank line
     ]);