[IOCOM-1897] Remove Green Pass

[Vangaorth]

Short description

This PR removes the Green Pass mock implementation

List of changes proposed in this pull request

• Relevant code has been removed
• One legacy message has been left in the message list, in order to test message selection for IO App

How to test

Using the IO App, check that messages are still working.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.85%. Comparing base (e92e063) to head (78aee8b).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #439      +/-   ##
==========================================
- Coverage   63.85%   63.85%   -0.01%     
==========================================
  Files         167      166       -1     
  Lines        5437     5398      -39     
  Branches      746      742       -4     
==========================================
- Hits         3472     3447      -25     
+ Misses       1964     1950      -14     
  Partials        1        1              

Files with missing lines	Coverage Δ
src/config.ts	96.15% <ø> (ø)
...c/features/messages/persistence/messagesPayload.ts	96.05% <ø> (ø)
src/features/messages/types/messagesConfig.ts	100.00% <ø> (ø)
src/populate-persistence.ts	78.51% <100.00%> (-0.62%)	⬇️
src/server.ts	100.00% <ø> (ø)

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[Ladirico]

LGTM! 🚀