[analysis_server] Fix filtering of code actions to exclude mismatched kinds instead of throwing

No current tests hit this, but if you call verifyCodeActionLiteralEdits without a "title", you could trigger a failed expectation here that you should not - the mismatched actions should just be filtered out.

Change-Id: I6962c9f99a7a3051afcf3f76ad90945cd1381e0e
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/429621
Reviewed-by: Samuel Rawlins <[email protected]>
Commit-Queue: Brian Wilkerson <[email protected]>
Reviewed-by: Brian Wilkerson <[email protected]>

Author: DanTup

pkg/analysis_server/test/lsp/code_actions_mixin.dart

@@ -236,8 +236,8 @@ mixin CodeActionsTestMixin
         return false;
       }
 
-      if (kind != null) {
-        expect(actionKind, kind);
+      if (kind != null && actionKind != kind) {
+        return false;
       }
 
       // Some tests filter by only supplying a command, so if there is no