Add pubspecs to Dart tests and scripts executed by checked in SDK

Without their own pubspecs, they belong to `_` project from the root
`pubspec.yaml`. As a result, once we bump the SDK version, these
scripts cannot be executed with the checked in sdk.

Note: when we bump the SDK version we also must bump the version in
the root pubspec, otherwise unreleased language experiments break.
Change-Id: Ie2ec35865a5966d6801de832a4b6ad312a24d277
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/436901
Reviewed-by: Johnni Winther <johnniwinther@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
Commit-Queue: Ivan Inozemtsev <iinozemtsev@google.com>

pubspec.yaml

@@ -76,9 +76,11 @@ workspace:
   - pkg/vm_service_protos
   - pkg/vm_snapshot_analysis
   - pkg/wasm_builder
+  - runtime/tests/vm/dart
   - runtime/tools/profiling
   - samples/ffi/http
   - samples/ffi/httpIG
+  - tests/ffi
   # dap and language_server_protocol are checked in to and
   # developed in the SDK repo, though they are located in `third_party/`.
   - third_party/pkg/dap
@@ -86,6 +88,7 @@ workspace:
   - tools/package_deps
   - tools/verify_docs
   - tools
+  - utils
 
 # All third_party packages are retrieved via the DEPS-file and overridden here.
 dependency_overrides:

runtime/tests/vm/dart/pubspec.yaml

@@ -0,0 +1,8 @@
+name: runtime_tests_vm_dart
+description: VM Dart tests
+
+environment:
+  sdk: ^3.8.0
+
+resolution: workspace
+publish_to: none

tests/ffi/pubspec.yaml

@@ -0,0 +1,8 @@
+name: tests_ffi
+description: FFI tests
+
+environment:
+  sdk: ^3.8.0
+
+resolution: workspace
+publish_to: none

tools/generate_package_config.dart

@@ -82,9 +82,11 @@ $overrides
               rootUri.startsWith('../pkg/') || // SDK package
               rootUri.startsWith('../samples/') || // sample package
               rootUri.startsWith('../runtime/') || // VM package
+              rootUri.startsWith('../tests/ffi') || // FFI tests
               rootUri.startsWith(
                 '../tools',
               ) || // A tool package for developing the SDK.
+              rootUri.startsWith('../utils' ) || // Utils for building the SDK.
               rootUri == '../' // The main workspace package
           )) {
         print('Package ${package['name']} is imported from outside the SDK.');

utils/pubspec.yaml

@@ -0,0 +1,8 @@
+name: utils
+description: Internal utils for building Dart SDK.
+
+environment:
+  sdk: ^3.8.0
+
+resolution: workspace
+publish_to: none