Remove multiple and redundant track flags

[dzumii]

Description

Remove multiple, redundant tracking flags and keep a single boolean flag with a default false value, such that by default we do not track runs for now.

Changes to be made

Change the track_serve flag to track and ensure it tracks the session without the need to use track_run again.
Remove the track_run flag
Compare the output with the output of the former state.

Status
Successfully changed the multiple track flags into one (track)
track flag has been moved to serve

To do
Confirm that the metrics of several run sessions of the same model are appended to the same file

Related to #1158 #1090

[dzumii]

Hello @DhanshreeA
I've been able to remove redundant track flags. Now, users only have to use the track flag at the point of serving the model alone and don't need to use it for every model run. Also, I confirmed the metrics for each run are saved to the same session file. For example, I ran the model six times with different inputs, and the metrics for the six runs are in the txt file.

[DhanshreeA]

@dzumii LGTM, requesting few minor changes.