No did-you-mean-to-call error on casts (#42626)

I chose to do the ad-hoc check rather than yet another tree walk.

1. It's faster to run and easier to read.
2. This error came from looking at real code. It happened twice, so I
think the best estimate for other uses that happened zero times is in
fact zero.
3. I couldn't think of other places to put the cast, given the
restrictions on `testedNode` just before the new code.

src/compiler/checker.ts

@@ -34546,8 +34546,11 @@ namespace ts {
                 : isPropertyAccessExpression(location) ? location.name
                 : isBinaryExpression(location) && isIdentifier(location.right) ? location.right
                 : undefined;
+            const isPropertyExpressionCast = isPropertyAccessExpression(location)
+                && isParenthesizedExpression(location.expression)
+                && isAssertionExpression(location.expression.expression);
 
-            if (!testedNode) {
+            if (!testedNode || isPropertyExpressionCast) {
                 return;
             }