Drop support for published jwt-vc-issuer endpoint

[Zicchio]

PR #328 added the possibility to publish metadata endpoints, with /.well-known/jwt-vc-issuer and /.well-known/jar-issuer used as default example.
However, it appears that the endpoint /.well-known/jwt-vc-issuer should not be published as it might be reserved to issuers of verifiable credentials, which we are not.

One possible quick solution is to let DirectTrustSdJwtVc ovveride the method

eudi-wallet-it-python/pyeudiw/trust/handler/_direct_trust_jwk.py

Lines 131 to 140 in 1db0bc5

	def build_metadata_endpoints(self, backend_name: str, entity_uri: str) -> list[tuple[str, Callable[[satosa.context.Context, Any], satosa.response.Response]]]:
	if not self.jwk_endpoint:
	return []
	metadata_path = '^' + self._build_metadata_path(backend_name) + '$'
	response_json = self._build_metadata_with_issuer_jwk(entity_uri)
	def metadata_response_fn(ctx: satosa.context.Context, *args) -> satosa.response.Response:
	return JsonResponse(message=response_json)
	return [(metadata_path, metadata_response_fn)]

with a simple return []