Remove deprecated originalKeywordKind and isInJSDocNamespace (#58228)

Author: jakebailey

src/deprecatedCompat/5.0/identifierProperties.ts

@@ -2,4 +2,3 @@
 
 export * from "../../compiler/_namespaces/ts";
 export * from "../deprecations";
-export * from "../5.0/identifierProperties";

src/deprecatedCompat/_namespaces/ts.ts

@@ -205,10 +205,6 @@ export function sourceFileToJSON(file: ts.Node): string {
                     }
                     break;
 
-                case "originalKeywordKind":
-                    o[propertyName] = getKindName((n as any)[propertyName]);
-                    break;
-
                 case "flags":
                     // Clear the flags that are produced by aggregating child values. That is ephemeral
                     // data we don't care about in the dump. We only care what the parser set directly

src/harness/harnessUtils.ts

@@ -4378,12 +4378,6 @@ declare namespace ts {
     interface Identifier {
         readonly text: string;
     }
-    interface Identifier {
-        /** @deprecated Use `idKeyword(identifier)` instead. */
-        readonly originalKeywordKind?: SyntaxKind;
-        /** @deprecated Use `.parent` or the surrounding context to determine this instead. */
-        readonly isInJSDocNamespace?: boolean;
-    }
     interface TransientIdentifier extends Identifier {
         resolvedSymbol: Symbol;
     }