[release-v1.30] Drop check for legacy traefik v1 chart

[brandond]

Proposed Changes

Drop check for legacy traefik v1 chart

We have been bundling traefik v2 for three years, its time to drop the legacy chart check

Types of Changes

tech debt

Verification

See linked issue

Testing

Linked Issues

• Disable Traefik v1 handling #9289
• Traefik 2.0 integration #1141

User-Facing Change

K3s no longer automatically skips deploying traefik v2 if traefik v1 is present. All clusters should have been upgraded to v2 at some point over the last three years.

Further Comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.88%. Comparing base (86f1021) to head (ae62605).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9593      +/-   ##
==========================================
- Coverage   49.44%   42.88%   -6.56%     
==========================================
  Files         151      154       +3     
  Lines       13471    13509      +38     
==========================================
- Hits         6661     5794     -867     
- Misses       5467     6547    +1080     
+ Partials     1343     1168     -175     

Flag	Coverage Δ
e2etests	?
inttests	39.45% <ø> (+0.04%)	⬆️
unittests	15.96% <ø> (?)

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[brandond]

moving to WIP until v1.30

[brandond]

Ready for review, but DO NOT MERGE until after we branch release-1.29 from master