chore(charm): Replace Traefik route with generic ingress

[pedro-avalos]

Description

• This PR replaces Traefik route with the generic ingress charm relation
• Our use-cases and deployments benefit more from the generic ingress relation

Related Issue(s)

Testing

• Unit tests
• Integration testing

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

❌ Patch coverage is 92.68293% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.17%. Comparing base (2aaeaeb) to head (1c81467).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #542      +/-   ##
==========================================
- Coverage   89.27%   89.17%   -0.10%     
==========================================
  Files          28       29       +1     
  Lines        1417     1423       +6     
  Branches        4        5       +1     
==========================================
+ Hits         1265     1269       +4     
- Misses        151      154       +3     
+ Partials        1        0       -1     

Flag	Coverage Δ		*Carryforward flag
charm	100.00% <ø> (ø)		Carriedforward from 0464b18
client	80.24% <ø> (ø)		Carriedforward from 0464b18
server	96.97% <ø> (-0.06%)	⬇️	Carriedforward from 0464b18

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

Components	Coverage Δ
Server	96.85% <ø> (ø)
Charm	94.66% <92.68%> (-2.44%)	⬇️
Client	80.24% <ø> (ø)

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