doctl sls fn invoke not handling function timeout correctly

[rabbah]

Describe the Issue:

Invoke a function that times out, e.g.:

> time doctl sls fn invoke sleep
Request accepted, but processing not completed yet. 
All functions invocation >= 30s will get demoted to an asynchronous invocation. Use --no-wait flag to immediately return the activation id. 

Use this command to view the results.
doctl sls activations result <nil> 


real	0m11.501s
user	0m0.043s
sys	0m0.024s

Observe that the activation id is <nil> and the response was a function timeout (confirmed with activation list) after ~10s not 30s. The error message is misleading and the id is missing.

I believe what's happening is that the response isn't handled correctly (the API response is (via the http path):

{"error":"The action exceeded its time limits of 10000 milliseconds during initialization."}

with no activation id in this case since the response terminate in time.

Environment:

• doctl version: doctl version 1.91.1-release (sls version 5.0.18)
• OS: macOS
• Installation method: download from github release

Additional Details: