Support Flow as expressions in ESLint rules (#27590)

Support Flow `as` expressions in ESLint rules, e.g. `<expr> as <type>`.
This is the same syntax as TypeScript as expressions. I just looked for
any place referencing `TSAsExpression` (the TS node) or
`TypeCastExpression` (the previous Flow syntax) and added a case for
`AsExpression` as well.

DiffTrain build for [6bfc0e0](6bfc0e0)

Author: kassens

compiled/facebook-www/REVISION

@@ -1 +1 @@
-d947c2f1100dfd006fd91c6e9ed84d42ca7ab088
+6bfc0e032acc7e5ad6da2a09f3c4f47f3321da2c

compiled/facebook-www/eslint-plugin-react-hooks.js

@@ -960,7 +960,7 @@ var ExhaustiveDeps = {
           return false;
         }
 
-        while (init.type === 'TSAsExpression') {
+        while (init.type === 'TSAsExpression' || init.type === 'AsExpression') {
           init = init.expression;
         } // Detect primitive constants
         // const foo = 42
@@ -2232,8 +2232,7 @@ function getConstructionExpressionType(node) {
       return null;
 
     case 'TypeCastExpression':
-      return getConstructionExpressionType(node.expression);
-
+    case 'AsExpression':
     case 'TSAsExpression':
       return getConstructionExpressionType(node.expression);
   }