chore: Replace NGINX with Traefik in Terraform modules

[pedro-avalos]

Description

• This PR updates the Terraform modules to use Traefik (and LEGO) instead of NGINX
• NGINX is deprecated, we are transitioning to using Traefik as the recommended ingress

Related Issue(s)

Untracked

Testing

• TODO: test on staging

Checklist

• I have followed the contribution guidelines.
• I have signed the Canonical CLA.
• I have added necessary tests.
• I have added or updated any relevant documentation (if needed).
• I have tested the changes.

Additional Notes

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.27%. Comparing base (7d67c39) to head (da25fec).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #503   +/-   ##
=======================================
  Coverage   89.27%   89.27%           
=======================================
  Files          28       28           
  Lines        1417     1417           
  Branches        4        4           
=======================================
  Hits         1265     1265           
  Misses        151      151           
  Partials        1        1           

Flag	Coverage Δ		*Carryforward flag
charm	100.00% <ø> (ø)		Carriedforward from 7d67c39
client	80.24% <ø> (ø)		Carriedforward from 7d67c39
server	97.03% <ø> (ø)		Carriedforward from 7d67c39

*This pull request uses carry forward flags. Click here to find out more.

Components	Coverage Δ
Server	96.85% <ø> (ø)
Charm	97.10% <ø> (ø)
Client	80.24% <ø> (ø)

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