Add per-site authorize URL and per-domain token URL OAuth2 plumbing

Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>

pkg/connector/provider/apply.go

@@ -47,6 +47,8 @@ func (r *Registry) ApplyOAuth2Defaults(p string, redirectURI string, c *connecto
 	c.TokenEndpointAuth = reg.TokenEndpointAuth
 	c.SupportsIncrementalAuth = reg.SupportsIncrementalAuth
 	c.RequiresPKCE = reg.RequiresPKCE
+	c.BuildAuthURLForSite = reg.BuildAuthURLForSite
+	c.BuildTokenURLForDomain = reg.BuildTokenURLForDomain
 
 	// Deep copy ExtraAuthParams so per-connector mutations (e.g.
 	// incremental auth, scope overrides) cannot alias back into the