chore(build): Temporarily exclude blocks and generators .d.ts files (#6930)

Temporarily exclude the generated .d.ts files for blocks/* and
generators/* from the package.

This will in due course replace the (very simplistic) hand-written
versions in typings/, but for now they are not referenced
anywhere a developer's tooling should be looking, and contain
in some cases actually incorrect typings (e.g., in unmigrated
blocks files, the blocks export is typed as ObjectConstructor,
which is wrong), so do not include them in the package least they
cause problems for the unwary.

scripts/gulpfiles/package_tasks.js

@@ -346,7 +346,10 @@ function packageDTS() {
     'typings/msg/*.d.ts',
   ];
   return gulp.src(handwrittenSrcs, {base: 'typings'})
-      .pipe(gulp.src(`${TYPINGS_BUILD_DIR}/**/*.d.ts`))
+      .pipe(gulp.src(`${TYPINGS_BUILD_DIR}/**/*.d.ts`, {ignore: [
+	`${TYPINGS_BUILD_DIR}/blocks/**/*`,
+	`${TYPINGS_BUILD_DIR}/generators/**/*`,
+      ]}))
       .pipe(gulp.replace('AnyDuringMigration', 'any'))
       .pipe(gulp.dest(RELEASE_DIR));
 };