Remove session.notify after using the Add track workflow

[cmdcolin]

Currently, after any usage of the Add track workflow, and an "info" level alert snackbar says

"Open a new view, or use the track selector in an existing view, to view this track"

However the "Add track" workflow automatically shows the track in the "current view", so I think this message may be unneeded. I would suggest removing, but it could also be re-phrased to tell the user that it was added to the current view and it is available in the track selector

[cmdcolin]

also there is a case where there is no "current view" however if you use the global File->Open track with no views open it alerts "Please open a view to add a track first" so it seems unlikely for this to occur

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (8d445a9) 63.40% compared to head (1a849cd) 63.40%.

Files	Patch %	Lines
...TrackWidget/components/DefaultAddTrackWorkflow.tsx	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4123      +/-   ##
==========================================
- Coverage   63.40%   63.40%   -0.01%     
==========================================
  Files        1057     1057              
  Lines       30779    30777       -2     
  Branches     7330     7329       -1     
==========================================
- Hits        19516    19513       -3     
- Misses      11090    11091       +1     
  Partials      173      173              

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