add RayId to HttpServer span

[LokiWager]

Add RayId to HttpServer span when there is Cloudflare RayId header but no timestamp headers.

[codecov-commenter]

Codecov Report

Base: 73.16% // Head: 73.22% // Increases project coverage by +0.05% 🎉

Coverage data is based on head (b051409) compared to base (eec7d77).
Patch coverage: 100.00% of modified lines in pull request are covered.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #928      +/-   ##
==========================================
+ Coverage   73.16%   73.22%   +0.05%     
==========================================
  Files         131      131              
  Lines       15007    15008       +1     
==========================================
+ Hits        10980    10989       +9     
+ Misses       3403     3397       -6     
+ Partials      624      622       -2     

Impacted Files	Coverage Δ
pkg/tracing/cloudflare.go	90.00% <100.00%> (+0.34%)	⬆️
pkg/filters/headerlookup/headerlookup.go	84.61% <0.00%> (-1.40%)	⬇️
pkg/cluster/cluster.go	61.15% <0.00%> (+1.05%)	⬆️
pkg/filters/validator/basicauth.go	76.53% <0.00%> (+1.53%)	⬆️

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