[Improvement] migrate to Ubuntu 24.04

[hrideshmg]

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Closes #924

As discussed on Zulip the tests are currently broken due to an inconsistency with the Tesseract versions caused by the sample platform still using Ubuntu 22.04.

This PR aims to migrate the provisioned test runners to Ubuntu 24.04 to fix this bug as well as ensure future compatibility. All changes have been tested on a deployed fork of the project.

Notable Changes

• Updated the mono install step in the startup script to the updated versions from their site. Main motivation for this is that usage of apt-key is deprecated.
• libtesseract-dev no longer bundles the trained data for english, so it has to be installed separately.

Migration Guide

• config.py in the root folder will have to be modified to the following:

LINUX_INSTANCE_FAMILY_NAME = "ubuntu-minimal-2404-lts-amd64"

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.91%. Comparing base (4e7b2ea) to head (7c60c6c).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #925   +/-   ##
=======================================
  Coverage   86.91%   86.91%           
=======================================
  Files          35       35           
  Lines        3699     3699           
  Branches      759      759           
=======================================
  Hits         3215     3215           
  Misses        348      348           
  Partials      136      136           

Flag	Coverage Δ
unittests	86.91% <ø> (+0.03%)	⬆️

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