Disable signature help on unresolved bare identifiers; add more declaration info on other unresolved calls (#39352)

* Disable signature help on unresolved bare identifiers; add more declaration info on unresolvedproperty access

* Remove stray ts-ignore

tests/cases/fourslash/signatureHelpJSMissingIdentifier.ts

@@ -0,0 +1,9 @@
+/// <reference path="fourslash.ts" />
+
+// @allowJs: true
+// @checkJs: true
+
+// @Filename: test.js
+////log(/**/)
+
+verify.noSignatureHelp("");

tests/cases/fourslash/signatureHelpJSMissingPropertyAccess.ts

@@ -0,0 +1,19 @@
+/// <reference path="fourslash.ts" />
+
+// @allowJs: true
+// @checkJs: true
+
+// @Filename: test.js
+////foo.filter(/**/)
+
+goTo.marker("");
+verify.signatureHelp({
+  text: "ReadonlyArray.filter<S extends T>(predicate: (value: T, index: number, array: readonly T[]) => value is S, thisArg?: any): S[]",
+  overloadsCount: 2,
+  docComment: "Returns the elements of an array that meet the condition specified in a callback function.",
+  parameterDocComment: "A function that accepts up to three arguments. The filter method calls the predicate function one time for each element in the array.",
+  tags: [
+    { name: "param", text: "predicate A function that accepts up to three arguments. The filter method calls the predicate function one time for each element in the array." },
+    { name: "param", text: "thisArg An object to which the this keyword can refer in the predicate function. If thisArg is omitted, undefined is used as the this value." }
+  ]
+});