[MM-37772] Idiomatic naming (URL, URI, API) (#18128)

* s/Url/URL/g & s/Uri/URI/g

* s/Api/API/g

api4/config_test.go

@@ -170,7 +170,7 @@ func TestUpdateConfig(t *testing.T) {
 		require.Equal(t, SiteName, cfg.TeamSettings.SiteName, "It should update the SiteName")
 
 		t.Run("Should set defaults for missing fields", func(t *testing.T) {
-			_, err = th.SystemAdminClient.DoApiPut("/config", "{}")
+			_, err = th.SystemAdminClient.DoAPIPut("/config", "{}")
 			require.NoError(t, err)
 		})
 
@@ -584,7 +584,7 @@ func TestGetOldClientConfig(t *testing.T) {
 	t.Run("missing format", func(t *testing.T) {
 		client := th.Client
 
-		resp, err := client.DoApiGet("/config/client", "")
+		resp, err := client.DoAPIGet("/config/client", "")
 		require.Error(t, err)
 		require.Equal(t, http.StatusNotImplemented, resp.StatusCode)
 	})
@@ -592,7 +592,7 @@ func TestGetOldClientConfig(t *testing.T) {
 	t.Run("invalid format", func(t *testing.T) {
 		client := th.Client
 
-		resp, err := client.DoApiGet("/config/client?format=junk", "")
+		resp, err := client.DoAPIGet("/config/client?format=junk", "")
 		require.Error(t, err)
 		require.Equal(t, http.StatusBadRequest, resp.StatusCode)
 	})