Update dev-tool with new migration script location (#26664)

We changed the location of the onboarding script and I failed to [update the
PR.](#26532). This commit references the proper new script location.

common/tools/dev-tool/src/util/testProxyUtils.ts

@@ -177,7 +177,7 @@ export async function runMigrationScript(
 ): Promise<void> {
   const migrationScriptLocation = path.join(
     await resolveRoot(),
-    "eng/common/testproxy/transition-scripts/generate-assets-json.ps1"
+    "eng/common/testproxy/onboarding/generate-assets-json.ps1"
   );
 
   const argv = [migrationScriptLocation, "-TestProxyExe", await getTestProxyExecutable()];
@@ -219,8 +219,7 @@ export async function isProxyToolActive(): Promise<boolean> {
     await axios.get(`http://localhost:${process.env.TEST_PROXY_HTTP_PORT ?? 5000}/info/available`);
 
     log.info(
-      `Proxy tool seems to be active at http://localhost:${
-        process.env.TEST_PROXY_HTTP_PORT ?? 5000
+      `Proxy tool seems to be active at http://localhost:${process.env.TEST_PROXY_HTTP_PORT ?? 5000
       }\n`
     );
     return true;