fix: update flow

[jjmachan]

Description

• changed operator remove command to operator uninstall to make it more intuitive to the opposite command operator install
• Fixed the update workflow. Now operator update <operator-name> will update the operator to the latest version.
  closes:

[codecov]

Codecov Report

Merging #177 (33a8bf2) into main (4d50cd7) will decrease coverage by 0.16%.
The diff coverage is 38.46%.

@@            Coverage Diff             @@
##             main     #177      +/-   ##
==========================================
- Coverage   60.27%   60.10%   -0.17%     
==========================================
  Files          24       24              
  Lines        1110     1133      +23     
==========================================
+ Hits          669      681      +12     
- Misses        441      452      +11     

Flag	Coverage Δ
unit-tests	60.10% <38.46%> (-0.17%)	⬇️

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Impacted Files	Coverage Δ
bentoctl/operator/registry.py	58.26% <28.57%> (-1.91%)	⬇️
bentoctl/cli/operator_management.py	42.16% <63.63%> (+2.97%)	⬆️

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