[BugFix] Remove manage worker option

[gchhablani]

Scale worker is incorrect, and does not handle the resources/backend attributes gracefully. Removing it from frontend in this PR.

This feature can be re-added once the issues are fixed.

Similarly, start/stop worker is also problematic.

People start workers initially, and then switch to remote eval without stopping the workers.
These workers have to be manually shut down which consumes credits, and is impractical.

We have auto-scaling, and these users should never need to start/stop/restart things as long as that script works fine.
Also, we are working on auto-deciding the amount of resources to be allocated. Should be added soon, this will handle the scale workers issue.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.30%. Comparing base (96968d6) to head (f2b6141).
Report is 1110 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4416      +/-   ##
==========================================
- Coverage   72.93%   69.30%   -3.63%     
==========================================
  Files          83       20      -63     
  Lines        5368     3574    -1794     
==========================================
- Hits         3915     2477    -1438     
+ Misses       1453     1097     -356     

see 64 files with indirect coverage changes

see 64 files with indirect coverage changes

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