Always use basic for anonymous pings

[jonjohnsonjr]

Previously we would eschew any kind of wrapper if the ping returned a
200, but this means we don't correctly respond to challenges after the
initial ping. This is a half-fix, but for now we just assume basic if
the ping returns a 200 so that (at least) basic auth registries will
work.

[codecov-commenter]

Codecov Report

Merging #1207 (93de556) into main (379f5ca) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1207      +/-   ##
==========================================
- Coverage   74.55%   74.55%   -0.01%     
==========================================
  Files         111      111              
  Lines        8050     8048       -2     
==========================================
- Hits         6002     6000       -2     
  Misses       1464     1464              
  Partials      584      584              

Impacted Files	Coverage Δ
pkg/v1/remote/transport/transport.go	100.00% <100.00%> (ø)

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