[clang-format] Do not break on JS fields like on goto labels (#76233)

This regressions was introduced in
70d7ea0.
The commit moved some code and correctly picked up an explicit check for
not running on Verilog.
However, the moved code also never ran for JavaScript and after the
commit we run it there and
this causes the wrong formatting of:

```js
export type Params = Config&{
  columns: Column[];
};
```
into
```js
export type Params = Config&{
columns:
  Column[];
};
```

Author: ilya-biryukov

clang/lib/Format/UnwrappedLineParser.cpp

@@ -1650,8 +1650,10 @@ void UnwrappedLineParser::parseStructuralElement(
       return;
     }
     // In Verilog labels can be any expression, so we don't do them here.
-    if (!Style.isVerilog() && Tokens->peekNextToken()->is(tok::colon) &&
-        !Line->MustBeDeclaration) {
+    // JS doesn't have macros, and within classes colons indicate fields, not
+    // labels.
+    if (!Style.isJavaScript() && !Style.isVerilog() &&
+        Tokens->peekNextToken()->is(tok::colon) && !Line->MustBeDeclaration) {
       nextToken();
       Line->Tokens.begin()->Tok->MustBreakBefore = true;
       FormatTok->setFinalizedType(TT_GotoLabelColon);

clang/unittests/Format/FormatTestJS.cpp

@@ -2836,5 +2836,11 @@ TEST_F(FormatTestJS, AlignConsecutiveAssignmentsAndDeclarations) {
                Style);
 }
 
+TEST_F(FormatTestJS, DontBreakFieldsAsGoToLabels) {
+  verifyFormat("export type Params = Config&{\n"
+               "  columns: Column[];\n"
+               "};");
+}
+
 } // namespace format
 } // end namespace clang