acc: Minor fixes in script in restricted-execution (#3126)

- The second summary command does not return json, so passing it to jq
is confusing (jq also does not fail on empty input).
- Use musterr to show that error is intentional.

Author: denik

acceptance/bundle/python/restricted-execution/output.txt

@@ -13,10 +13,12 @@
 value_from_env
 
 === With DATABRICKS_BUNDLE_RESTRICTED_CODE_EXECUTION=1, no envs are accessible
->>> errcode uv run [UV_ARGS] -q [CLI] bundle summary
+>>> musterr uv run [UV_ARGS] -q [CLI] bundle summary
 Error: Running Python code is not allowed when DATABRICKS_BUNDLE_RESTRICTED_CODE_EXECUTION is set
 
-Exit code: 1
+Exit code (musterr): 1
+
+>>> musterr cat envs.txt
 cat: envs.txt: No such file or directory
 
-Exit code: 1
+Exit code (musterr): 1

acceptance/bundle/python/restricted-execution/script

@@ -10,7 +10,7 @@ rm -rf envs.txt
 
 export DATABRICKS_BUNDLE_RESTRICTED_CODE_EXECUTION=1
 title "With DATABRICKS_BUNDLE_RESTRICTED_CODE_EXECUTION=1, no envs are accessible"
-trace errcode uv run $UV_ARGS -q $CLI bundle summary | jq '.experimental'
-errcode cat envs.txt
+trace musterr uv run $UV_ARGS -q $CLI bundle summary
+trace musterr cat envs.txt
 
 rm -fr .databricks __pycache__