fix(dynamite): Fix pattern check for enums

[provokateurin]

The pattern has to be checked after the value has been serialized (not only applies to enums, but that's the only use case so far).

[Leptopoda]

Please add a unit test to dynamite_e2e.
I'd suggest a new spec just for pattern checking.

For enums we should be able to verify the pattern at generation time as the value of an enum is constant. Should we do so long term? If so we should open an issue for that.

[provokateurin]

Yes, I forgot to add the test before creating the PR 😅
Checking enums at build time sounds good, for other cases we still need this change. Can you open an issue for that?

[Leptopoda]

I think that it'll fit better into:
https://github.com/nextcloud/neon/blob/main/packages/dynamite/dynamite_end_to_end_test/lib/pattern_check.openapi.json

Other than that LGTM

[provokateurin]

Right but in this case I don't want to test the pattern checking itself but that it works with serialized parameters (which was broken before).
Also I made a mistake which I'm fixing right now.

[Leptopoda]

blocking for now

[provokateurin]

A null input for the pattern checks is always allowed. This was not handled correctly and the tests for it were also wrong. If the input is not allowed to be null then it needs to be checked elsewhere and not with the patterns.