fix(common): type conversion from str for a custom resource

[iulianbarbu]

Description of change

We're missing the Custom resource type conversion from str.

How has this been tested? (if applicable)

Reproduced when I deployed the custom-resource/pdo example.
TODO: test the project deployment again after the fix.

[oddgrd]

This gives me a feeling of déjà vu, I thought we fixed this a while back 😅

[iulianbarbu]

I was surprised to see the error too. Not sure what we've fixed the last time, or if we introduced a regression in the meantime. I haven't digged into it, but it might not be worth doing it.