BPN Group API example leads to group resolution failure

[rafaelmag110]

Describe the bug

This might seem like a nit, but when users check the API spec to understand how to use the BPN Group API, they see the following example:

tractusx-edc/edc-extensions/bpn-validation/bpn-validation-api/src/main/java/org/eclipse/tractusx/edc/api/bpn/v3/BusinessPartnerGroupApiV3.java

Lines 91 to 98 in 509ed4b

	{
	"@context": {
	"tx": "https://w3id.org/tractusx/v0.0.1/ns/"
	},
	"@id": "tx:BPN000001234",
	"tx:groups": ["group1", "group2", "group3"]
	}
	""";

Having the @id attribute prefixed with the tractusx context tx will lead to errors when the BPNL is resolved from the store for policy evaluation. In that case, the BPNL value is resolved from a token and doesn't contain the tx context.

To Reproduce

Save a BPN Group as shown in the documentation.
Try to resolve the BPN group using the API.

Context Information

Present since the BPN Group API was introduced.

Possible Implementation

Remove the tx context from the @id attribute from the API example.