fix: different schedules in consecutive weeks

[limwa]

This PR fixes an issue where schedules of consecutive weeks were merged and displayed all on the same weekday.

This happens because when we fetch the lectures from the API, we send (in today's case) pv_semana_ini=20240228 and pv_semana_fim=20240305. This is the equivalent of a week starting today. The problem arises because, for those parameters, the API returns the lectures between 25-02-2024 and 09-03-2024, since those are the 2 blocks that intercept the range of dates we asked for.

To fix this, we now issue 1 request per week (the smallest block possible) to be able to determine the full date of each class (the API only returns the weekday).

This also required changes to the widgets to support these new functionalities.

PR-specific Tasks

• Achieve desired functionality in API fetcher
• Achieve desired functionality in HTML fetcher
• Refactor code to make it more reusable and understandable

Review checklist

• Terms and conditions reflect the current change
• Contains enough appropriate tests
• If aimed at production, writes a new summary in whatsnew/whatsnew-pt-PT
• Properly adds an entry in changelog.md with the change
• If PR includes UI updates/additions, its description has screenshots
• Behavior is as expected
• Clean, well-structured code

[codecov]

Codecov Report

Merging #1170 (5bd8dd0) into develop (a5ad009) will increase coverage by 1%.
Report is 2 commits behind head on develop.
The diff coverage is 74%.

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #1170   +/-   ##
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+ Coverage       15%     16%   +1%     
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  Files          228     230    +2     
  Lines         6907    7003   +96     
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+ Hits          1027    1086   +59     
- Misses        5880    5917   +37     

[LuisDuarte1]

Excellent work overall, but it was a difficult bug fix overall (dates are really difficult to work with properly) 🚀 🚀 just have some concerns below.

[limwa]

Disabled auto-merge because I still need to test these latest changes

[LuisDuarte1]

Great work 🚀 🚀

[bdmendes]

Great work. Below you can find some nitpicky comments.