chore(ssr-compiler): remove fixed FIXMEs (#5311)

* chore: remove comment

turns out it uses an empty object so no change is necessary

* chore: restore validation

* chore: todone

* chore: remove fixed fixme

seems to be covered by fixture packages/@lwc/engine-server/src/__tests__/fixtures/comments-slot/expected.html

Author: wjhsf

packages/@lwc/ssr-compiler/src/compile-js/decorators/wire.ts

@@ -171,7 +171,6 @@ export function catalogWireAdapters(
             }
         });
     } else {
-        // FIXME: for `@wire(Adapter), does engine-server use `undefined` or `{}` for config?
         reactiveConfig = b.objectExpression([]); // empty object
     }
 

packages/@lwc/ssr-compiler/src/compile-template/transformers/component/slotted-content.ts

@@ -79,8 +79,7 @@ const bAddSlottedContent = esTemplate`
     addSlottedContent(${/* slot name */ is.expression} ?? "", async function* __lwcGenerateSlottedContent(contextfulParent, ${
         /* scoped slot data variable */ isNullableOf(is.identifier)
     }, slotAttributeValue) {
-        // FIXME: make validation work again  
-        ${/* slot content */ false}
+        ${/* slot content */ is.statement}
     }, ${/* content map */ is.identifier});
 `<EsCallExpression>;
 

packages/@lwc/ssr-compiler/src/compile-template/transformers/slot.ts

@@ -66,8 +66,6 @@ const bConditionalSlot = esTemplateWithYield`
             // If we're in this else block, then the generator _must_ have yielded
             // something. It's impossible for a slottedContent["foo"] to exist
             // without the generator yielding at least a text node / element.
-            // FIXME: how does this work with comments and lwc:preserve-comments?
-            // TODO: default/fallback slot content
             ${/* slot fallback content */ is.statement}
         }