[PrimaryConstructors] Mark tests as SkipByDesign for dart2js/ddc

These tests use `external` modifier on constructors, and dart2js/ddc only supports external on constructors marked as JS-interop and therefore reports compile-time errors for these tests.

Change-Id: I7f55086170b06d2b31bda8c1916780622502df41
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/490540
Reviewed-by: Erik Ernst <eernst@google.com>
Commit-Queue: Johnni Winther <johnniwinther@google.com>

Author: johnniwinther

tests/co19/co19-dart2js.status

@@ -93,6 +93,11 @@ LanguageFeatures/Extension-types/static_analysis_extension_types_A28_t02: SkipBy
 LanguageFeatures/Extension-types/superinterfaces_of_extension_type_A05_t07: SkipByDesign # Non-JS-interop external members are not supported
 LanguageFeatures/Extension-types/syntax_A08_t02: SkipByDesign # Non-JS-interop external members are not supported
 LanguageFeatures/FinalizationRegistry/ffi/*: SkipByDesign # dart:ffi is not supported
+LanguageFeatures/Primary-constructors/grammar_A02_t08: SkipByDesign # External constructors are not supported
+LanguageFeatures/Primary-constructors/grammar_A05_t02: SkipByDesign # External constructors are not supported
+LanguageFeatures/Primary-constructors/grammar_A05_t04: SkipByDesign # External constructors are not supported
+LanguageFeatures/Primary-constructors/grammar_A05_t06: SkipByDesign # External constructors are not supported
+LanguageFeatures/Primary-constructors/grammar_A05_t08: SkipByDesign # External constructors are not supported
 LanguageFeatures/Wildcards/other_declarations_A01_t09: SkipByDesign # Non-JS-interop external members are not supported
 LanguageFeatures/Wildcards/other_declarations_A02_t07: SkipByDesign # Non-JS-interop external members are not supported
 LanguageFeatures/Wildcards/other_declarations_A06_t03: SkipByDesign # Non-JS-interop external members are not supported

tests/co19/co19-dartdevc.status

@@ -92,6 +92,11 @@ LanguageFeatures/Extension-types/static_analysis_extension_types_A28_t02: SkipBy
 LanguageFeatures/Extension-types/superinterfaces_of_extension_type_A05_t07: SkipByDesign # Non-JS-interop external members are not supported
 LanguageFeatures/Extension-types/syntax_A08_t02: SkipByDesign # Non-JS-interop external members are not supported
 LanguageFeatures/FinalizationRegistry/ffi/*: SkipByDesign # dart:ffi is not supported
+LanguageFeatures/Primary-constructors/grammar_A02_t08: SkipByDesign # External constructors are not supported
+LanguageFeatures/Primary-constructors/grammar_A05_t02: SkipByDesign # External constructors are not supported
+LanguageFeatures/Primary-constructors/grammar_A05_t04: SkipByDesign # External constructors are not supported
+LanguageFeatures/Primary-constructors/grammar_A05_t06: SkipByDesign # External constructors are not supported
+LanguageFeatures/Primary-constructors/grammar_A05_t08: SkipByDesign # External constructors are not supported
 LanguageFeatures/Wildcards/other_declarations_A01_t09: SkipByDesign # External variables are not supported
 LanguageFeatures/Wildcards/other_declarations_A02_t07: SkipByDesign # External variables are not supported
 LanguageFeatures/Wildcards/other_declarations_A06_t03: SkipByDesign # External variables are not supported