[native_assets_builder] Lock the build directory - fixes

[dcharkes]

Addresses these comments:

• [native_assets_builder] Lock the build directory #1384 (review)

[dcharkes]

@Hixie I don't see any documentation on flutter/flutter#4476 for how the magic constant was chosen. Would you happen to remember why 50 milliseconds?

[github-actions]

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Package	Change	Current Version	New Version	Needed Version	Looking good?
native_assets_cli	None	0.7.3-wip	0.7.3-wip	0.7.3-wip	✔️

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// Copyright (c) 2024, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

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pkgs/ffigen/example/libclang-example/generated_bindings.dart
pkgs/ffigen/example/shared_bindings/generate.dart
pkgs/ffigen/example/shared_bindings/lib/generated/a_gen.dart
pkgs/ffigen/example/shared_bindings/lib/generated/a_shared_b_gen.dart
pkgs/ffigen/example/shared_bindings/lib/generated/base_gen.dart
pkgs/ffigen/example/simple/generated_bindings.dart
pkgs/ffigen/lib/src/header_parser/clang_bindings/clang_bindings.dart
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pkgs/ffigen/test/header_parser_tests/expected_bindings/_expected_enum_int_mimic_bindings.dart
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pkgs/ffigen/test/header_parser_tests/expected_bindings/_expected_unions_bindings.dart
pkgs/ffigen/test/header_parser_tests/expected_bindings/_expected_varargs_bindings.dart
pkgs/ffigen/test/large_integration_tests/_expected_cjson_bindings.dart
pkgs/ffigen/test/large_integration_tests/_expected_libclang_bindings.dart
pkgs/ffigen/test/large_integration_tests/_expected_sqlite_bindings.dart
pkgs/ffigen/test/native_test/_expected_native_test_bindings.dart
pkgs/jni/lib/src/lang/jcharacter.dart
pkgs/jni/lib/src/third_party/generated_bindings.dart
pkgs/jni/lib/src/third_party/global_env_extensions.dart
pkgs/jni/lib/src/third_party/jni_bindings_generated.dart
pkgs/jnigen/android_test_runner/lib/main.dart
pkgs/jnigen/example/in_app_java/lib/android_utils.dart
pkgs/jnigen/example/kotlin_plugin/example/lib/main.dart
pkgs/jnigen/example/kotlin_plugin/lib/kotlin_bindings.dart
pkgs/jnigen/example/kotlin_plugin/lib/kotlin_plugin.dart
pkgs/jnigen/example/pdfbox_plugin/lib/pdfbox_plugin.dart
pkgs/jnigen/example/pdfbox_plugin/lib/src/third_party/org/apache/pdfbox/pdmodel/PDDocument.dart
pkgs/jnigen/example/pdfbox_plugin/lib/src/third_party/org/apache/pdfbox/pdmodel/PDDocumentInformation.dart
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pkgs/jnigen/example/pdfbox_plugin/lib/src/third_party/org/apache/pdfbox/text/PDFTextStripper.dart
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pkgs/jnigen/lib/src/bindings/descriptor.dart
pkgs/jnigen/lib/src/elements/elements.g.dart
pkgs/jnigen/test/jackson_core_test/third_party/bindings/com/fasterxml/jackson/core/_package.dart
pkgs/jnigen/tool/command_runner.dart
pkgs/swift2objc/lib/src/config.dart
pkgs/swift2objc/lib/src/generate_wrapper.dart
pkgs/swift2objc/lib/src/generator/_core/utils.dart
pkgs/swift2objc/lib/src/generator/generator.dart
pkgs/swift2objc/lib/src/generator/generators/class_generator.dart
pkgs/swift2objc/lib/src/parser/parsers/declaration_parsers/parse_property_declaration.dart
pkgs/swift2objc/lib/src/transformer/_core/unique_namer.dart
pkgs/swift2objc/lib/src/transformer/_core/utils.dart
pkgs/swift2objc/lib/src/transformer/transformers/transform_property.dart

Package publish validation ✔️

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Package	Version	Status
package:ffi	2.1.3-wip	WIP (no publish necessary)
package:ffigen	14.0.0-wip	WIP (no publish necessary)
package:jni	0.11.0-wip	WIP (no publish necessary)
package:jnigen	0.10.0	already published at pub.dev
package:native_assets_cli	0.7.3-wip	WIP (no publish necessary)
package:objective_c	1.1.0	already published at pub.dev
package:swift2objc	0.0.1-wip	WIP (no publish necessary)
package:swiftgen	0.0.1-wip	WIP (no publish necessary)

Documentation at https://github.com/dart-lang/ecosystem/wiki/Publishing-automation.

[coveralls]

coverage: 91.718%. remained the same
when pulling aae5159 on concurrency-fixes
into 4a357e0 on main.

[auto-submit]

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