Make update project settings endpoint call URL with template payload + add a labels blacklist

[jonathanv28]

This PR introduces three new configs (to be read from the yaml file) to the MLP API server. The configs that are being added are:

1. Endpoint to be called when the update projects settings endpoint is called
2. Request payload JSON template to be sent to the specified endpoint
3. Response URL template to be sent back to the user

Additionally, a labels blacklist config will be added that hides/prevents the labels contained within to not be modifiable

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.14%. Comparing base (688c2fc) to head (86c729b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #99      +/-   ##
==========================================
- Coverage   57.39%   57.14%   -0.25%     
==========================================
  Files          47       47              
  Lines        2354     2443      +89     
==========================================
+ Hits         1351     1396      +45     
- Misses        827      851      +24     
- Partials      176      196      +20     

Flag	Coverage Δ
api-test	57.14% <ø> (-0.25%)	⬇️

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[deadlycoconuts]

Left a couple of additional comments; please test your changes too to make sure they work 🙏🏼

[deadlycoconuts]

I think most of the changes now look good. I left some other comments, some are not really urgent/important, but the most important thing is to ensure the UI's working as expected. I'll approve this PR first but please take a look at the UI at least first :) 🚀