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

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

* s/Api/API/g

app/plugin_hooks_test.go

@@ -1093,7 +1093,7 @@ func TestHookMetrics(t *testing.T) {
 		metricsMock.On("ObservePluginHookDuration", pluginID, "UserHasBeenCreated", true, mock.Anything).Return()
 
 		// Don't care about these calls.
-		metricsMock.On("ObservePluginApiDuration", mock.Anything, mock.Anything, mock.Anything, mock.Anything).Return()
+		metricsMock.On("ObservePluginAPIDuration", mock.Anything, mock.Anything, mock.Anything, mock.Anything).Return()
 		metricsMock.On("ObservePluginMultiHookIterationDuration", mock.Anything, mock.Anything, mock.Anything).Return()
 		metricsMock.On("ObservePluginMultiHookDuration", mock.Anything).Return()