remove contour xDS server implementation

[skriss]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 55.55556% with 4 lines in your changes missing coverage. Please review.

Project coverage is 81.43%. Comparing base (8d46632) to head (70b2eff).

Files	Patch %	Lines
cmd/contour/serve.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6568      +/-   ##
==========================================
- Coverage   81.76%   81.43%   -0.33%     
==========================================
  Files         133      130       -3     
  Lines       15942    15731     -211     
==========================================
- Hits        13035    12811     -224     
- Misses       2614     2631      +17     
+ Partials      293      289       -4     

Files	Coverage Δ
cmd/contour/servecontext.go	85.79% <ø> (-0.16%)	⬇️
internal/contourconfig/contourconfiguration.go	98.68% <ø> (-0.01%)	⬇️
internal/xds/v3/callbacks.go	100.00% <100.00%> (ø)
internal/xdscache/v3/cluster.go	100.00% <ø> (ø)
internal/xdscache/v3/endpointslicetranslator.go	72.34% <ø> (-6.79%)	⬇️
internal/xdscache/v3/endpointstranslator.go	86.17% <ø> (-2.18%)	⬇️
internal/xdscache/v3/listener.go	91.72% <ø> (-0.40%)	⬇️
internal/xdscache/v3/route.go	95.58% <ø> (-0.71%)	⬇️
internal/xdscache/v3/runtime.go	96.87% <ø> (-3.13%)	⬇️
internal/xdscache/v3/secret.go	71.42% <ø> (-9.53%)	⬇️
... and 2 more

... and 2 files with indirect coverage changes