No errors at deployment when using runtime v4 with managed functions

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**Describe the bug**
When using runtime v4 with a JS/TS managed functions API, no error is shown during deployment with SWA CLI (shows success message) but no functions are actually deployed.

**Note:** Now, I know that v4 runtime is currently not supported, but I didn't at the time and was caught trying to understand why my functions were missing for hours.

**To Reproduce**
1. Create a SWA project with a function API using JS v4 runtime
2. Run SWA deploy

**Expected behavior**
A warning or error message should be displayed to the user to indicate that runtime v4 is not currently supported.

**Desktop (please complete the following information):**

- OS: MacOS
- Version 14.4