Moving diagnostics into a service (#14832)

* Moving diagnostics into a service

* Fixing golint checks

* Fixing tests

* Renaming from diagnostics to telemetry

* Adding missing files

* Initializing telemetry earlier in the server startup

* Fixing tests

* Adding a log for the telemetryID initialization error

* Addressing PR review comments

* Fixing merge problem

* Removing some extra Diagnostics mentions

* Making tests pass

templates/warn_metric_ack.html

@@ -55,12 +55,12 @@
                                             </td>
                                         </tr>
                                         {{end}}
-                                        {{if .Props.DiagnosticIdValue}}
+                                        {{if .Props.TelemetryIdValue}}
                                         <tr>
                                             <td style="border: 0; padding: 0 0 0 20px; text-align: left;">
                                                 <p style="font-weight: bold; margin-top: 0;">
-                                                    {{.Props.DiagnosticIdHeader}}
-                                                    {{.Props.DiagnosticIdValue}}</p>
+                                                    {{.Props.TelemetryIdHeader}}
+                                                    {{.Props.TelemetryIdValue}}</p>
                                             </td>
                                         </tr>
                                         {{end}}