Drop isDynamic check from isCCR

The analysis key already tells us this under normal conditions

src/actions-util.ts

@@ -258,15 +258,12 @@ export function isDefaultSetup(): boolean {
   return isDynamicWorkflow() && !isCCR();
 }
 
+/* The analysis key prefix used for CCR. */
+const CCR_KEY_PREFIX = "dynamic/copilot-pull-request-reviewer";
+
 /** Determines whether we are running in CCR. */
 export function isCCR(): boolean {
-  return (
-    (isDynamicWorkflow() &&
-      process.env[EnvVar.ANALYSIS_KEY]?.startsWith(
-        "dynamic/copilot-pull-request-reviewer",
-      )) ||
-    false
-  );
+  return process.env[EnvVar.ANALYSIS_KEY]?.startsWith(CCR_KEY_PREFIX) || false;
 }
 
 export function prettyPrintInvocation(cmd: string, args: string[]): string {