[che-operator] - enable che-server tracing

[sparkoo]

Is your enhancement related to a problem? Please describe.

Task of this epic #15046
To support tracing, we need to make it possible to enable and configure tracing of che server from che-operator.

Describe the solution you'd like

On che-server, tracing is configured with several options https://www.eclipse.org/che/docs/che-7/tracing-che/. The minimal values we need to set are CHE_TRACING_ENABLED and JAEGER_ENDPOINT.
For that, we will update CheCluster CRD with:

tracing:
  enable: # default false
  jaegerClientConfig:	# optional
    serviceName:"che-server"
    endpoint: "http://jaeger-collector:14268/api/traces"	# endpoint is mandatory for external jaeger
    sampler:
      managerHostPort: "jaeger:5778"
      type:"const"
      param:"1"
    reporter:
      maxQueueSize: "10000"

If tracing.enable:true enable che-server tracing and set other tracing config values as set in tracing.jaegerClientConfig with defaults https://www.eclipse.org/che/docs/che-7/tracing-che/

Set the default value of tracing.jaegerClientConfig.endpoint to instance we will create in our own namespace (#15214). In case of external Jaeger, It must be set to jaeger-collector service endpoint (http://.:14268/api/traces) -> JAEGER_ENDPOINT="http://<jaeger-collector-servicename>.<jaeger-namespace>:14268/api/traces".

Additional context

epic: #15046
analysis: #15136 proposal v3 #15136 (comment)

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[che-bot]

Issues go stale after 180 days of inactivity. lifecycle/stale issues rot after an additional 7 days of inactivity and eventually close.

Mark the issue as fresh with /remove-lifecycle stale in a new comment.

If this issue is safe to close now please do so.

Moderators: Add lifecycle/frozen label to avoid stale mode.