Trace UI demo (#20297)

* Add integration with Jeager
Add Jaeger datasource and modify derived fields in loki to allow for opening a trace in Jager in separate split.
Modifies build so that this branch docker images are pushed to docker hub
Add a traceui dir with docker-compose and provision files for demoing.:wq

* Enable docker logger plugin to send logs to loki

* Add placeholder zipkin datasource

* Fixed rebase issues, added enhanceDataFrame to non-legacy code path

* Trace selector for jaeger query field

* Fix logs default mode for Loki

* Fix loading jaeger query field services on split

* Updated grafana image in traceui/compose file

* Fix prettier error

* Hide behind feature flag, clean up unused code.

* Fix tests

* Fix tests

* Cleanup code and review feedback

* Remove traceui directory

* Remove circle build changes

* Fix feature toggles object

* Fix merge issues

* Fix some null errors

* Fix test after strict null changes

* Review feedback fixes

* Fix toggle name

Co-authored-by: David Kaltschmidt <david.kaltschmidt@gmail.com>

packages/grafana-data/src/datetime/datemath.ts

@@ -26,7 +26,11 @@ export namespace dateMath {
    * @param roundUp See parseDateMath function.
    * @param timezone Only string 'utc' is acceptable here, for anything else, local timezone is used.
    */
-  export function parse(text: string | DateTime | Date, roundUp?: boolean, timezone?: TimeZone): DateTime | undefined {
+  export function parse(
+    text?: string | DateTime | Date | null,
+    roundUp?: boolean,
+    timezone?: TimeZone
+  ): DateTime | undefined {
     if (!text) {
       return undefined;
     }