feat: change release_delay type from bool to float

[xaviml]

related to #497

[github-actions]

🚀 Deployed on https://629a7010696327009efde25e--controllerx.netlify.app

[codecov]

Codecov Report

Merging #501 (f0e88a8) into main (0132279) will not change coverage.
The diff coverage is 100%.

@@         Coverage Diff         @@
##           main   #501   +/-   ##
===================================
  Coverage    96%    96%           
===================================
  Files        58     58           
  Lines      2181   2181           
===================================
  Hits       2091   2091           
  Misses       90     90           

Impacted Files	Coverage Δ
...pps/controllerx/cx_core/release_hold_controller.py	100% <100%> (ø)

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