feat: spot vs ondemand for executors

[deepankarm]

Goal

• [x] Run Integration tests GHA manually & comment the link :point_right: https://github.com/jina-ai/jcloud/actions/runs/2453943603

@jina-ai/team-wolf

[codecov[bot]]

Codecov Report

Merging #54 (f49d51c) into main (28ff020) will decrease coverage by 9.54%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #54      +/-   ##
==========================================
- Coverage   48.25%   38.70%   -9.55%     
==========================================
  Files          15       15              
  Lines         974      974              
==========================================
- Hits          470      377      -93     
- Misses        504      597      +93     

Flag	Coverage Δ
jcloud	38.70% <ø> (-9.55%)	:arrow_down:

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Impacted Files	Coverage Δ
jcloud/flow.py	35.00% <0.00%> (-48.85%)	:arrow_down:
jcloud/helper.py	59.04% <0.00%> (-17.15%)	:arrow_down:
jcloud/api.py	45.58% <0.00%> (+17.64%)	:arrow_up:
jcloud/env_helper.py	84.67% <0.00%> (+22.58%)	:arrow_up:

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