Namespace bug fix

[venkatajagannath]

While setting up a Ray cluster on K8, we need to provide namespace option.

The expected behavior is to pick the namespace provided in the connection (using self.get_namespace()) or use default

The code though has a bug. If the namespace is not provided in the connection, it does not use the default.

This is because the variable created in the init method is not used in the setup_ray_cluster & delete_ray_cluster methods. Instead a direct call is made to self.get_namespace()

This PR fixes that bug

[pankajkoti]

is there an open issue we could link to the PR? Could we please also enhance the PR description to provide some more details on what the bug was? And how we are fixing it.

This will help review easier to understand on what's getting fixed & for what reason.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.16%. Comparing base (fd9807b) to head (bd4539a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #59      +/-   ##
==========================================
+ Coverage   95.42%   98.16%   +2.74%     
==========================================
  Files           5        5              
  Lines         546      546              
==========================================
+ Hits          521      536      +15     
+ Misses         25       10      -15     

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