feat: idp v2 api GetIDPByID (#8425)

# Which Problems Are Solved

GetIDPByID as endpoint in the API v2 so that it can be available for the
new login.

# How the Problems Are Solved

Create GetIDPByID endpoint with IDP v2 API, throught the GetProviderByID
implementation from admin and management API.

# Additional Changes

- Remove the OwnerType attribute from the response, as the information
is available through the resourceOwner.
- correct refs to messages in proto which are used for doc generation
- renaming of elements for API v3

# Additional Context

Closes #8337

---------

Co-authored-by: Livio Spring <livio.a@gmail.com>

internal/api/ui/login/policy_handler.go

@@ -18,7 +18,7 @@ func (l *Login) getOrgDomainPolicy(r *http.Request, orgID string) (*query.Domain
 }
 
 func (l *Login) getIDPByID(r *http.Request, id string) (*query.IDPTemplate, error) {
-	return l.query.IDPTemplateByID(r.Context(), false, id, false)
+	return l.query.IDPTemplateByID(r.Context(), false, id, false, nil)
 }
 
 func (l *Login) getLoginPolicy(r *http.Request, orgID string) (*query.LoginPolicy, error) {