Fix error handling for TDX quote generation in production

[ameba23]

In entropy-tss, real (non-mock) TDX quotes are currently only generated when the production feature flag is enabled.

Unfortunately that means the code behind that flag is not tested in CI. I recently set up a test network on TDX hardware to test attestation, and entropy-tss would not compile with the production feature flag enabled due to the error type which config-tsm::generate_quote having changed. This PR fixes that.

I have also made an issue to have the error type improved before the next release of configfs-tsm: entropyxyz/configfs-tsm#7

We could also consider adding cargo check -p entropy-tss --feature production to our CI.

[HCastano]

👍

Yeah we definitely should be checking all the features during CI builds. I say we could even do it as part of this PR, but since we're not really testing on TDX hardware wait a bit to save ourselves the extra CI run time for now.