[MM-60609][MM-60612] Include Desktop App metrics in PerformanceReporter, add metrics in Prometheus for CPU/Memory usage (#28825)

* [MM-60609][MM-60612] Include Desktop App metrics in PerformanceReporter, add metrics in Prometheus for CPU/Memory usage

* Fix mocks

* PR feedback

server/einterfaces/metrics.go

@@ -120,4 +120,6 @@ type MetricsInterface interface {
 	ObserveMobileClientTeamSwitchDuration(platform string, elapsed float64)
 	ClearMobileClientSessionMetadata()
 	ObserveMobileClientSessionMetadata(version string, platform string, value float64, notificationDisabled string)
+	ObserveDesktopCpuUsage(platform, version, process string, usage float64)
+	ObserveDesktopMemoryUsage(platform, version, process string, usage float64)
 }

server/einterfaces/mocks/MetricsInterface.go

@@ -353,6 +353,16 @@ func (_m *MetricsInterface) ObserveClusterRequestDuration(elapsed float64) {
 	_m.Called(elapsed)
 }
 
+// ObserveDesktopCpuUsage provides a mock function with given fields: platform, version, process, usage
+func (_m *MetricsInterface) ObserveDesktopCpuUsage(platform string, version string, process string, usage float64) {
+	_m.Called(platform, version, process, usage)
+}
+
+// ObserveDesktopMemoryUsage provides a mock function with given fields: platform, version, process, usage
+func (_m *MetricsInterface) ObserveDesktopMemoryUsage(platform string, version string, process string, usage float64) {
+	_m.Called(platform, version, process, usage)
+}
+
 // ObserveEnabledUsers provides a mock function with given fields: users
 func (_m *MetricsInterface) ObserveEnabledUsers(users int64) {
 	_m.Called(users)