Gaia-X registry path is hardcoded

[markendos]

Hi, when trying to verify VCs against a Gaia-X registry, I was not able to use a specific environment (e.g. v1, v1-staging, development) from the available Gaia-X instances since apparently v2 environment endpoint is hardcoded:

VCVerifier/gaiax/gaiaXClient.go

Line 18 in 99b4b88

const GAIAX_REGISTRY_TRUSTANCHOR_FILE = "/v2/api/trustAnchor/chain/file"

It would be nice to allow full path customization from the service configuration or some approach to make this more flexible in future releases.