use / instead of - in IR Route Name

[arkodg]

• also use / instead of - in Authentication Filter naming
• also replaced hostname dots to workaround stats: Tag extraction doesn't work if resource name contains dots envoy#4357

[arkodg]

keeping in draft mode until #1798 is merged

[codecov]

Codecov Report

Merging #1814 (f0804c6) into main (c7c0b9d) will increase coverage by 0.11%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1814      +/-   ##
==========================================
+ Coverage   65.12%   65.23%   +0.11%     
==========================================
  Files          86       86              
  Lines       12469    12473       +4     
==========================================
+ Hits         8120     8137      +17     
+ Misses       3829     3820       -9     
+ Partials      520      516       -4     

Files Changed	Coverage Δ
internal/gatewayapi/route.go	88.38% <100.00%> (+0.01%)	⬆️
internal/xds/translator/authentication.go	65.21% <100.00%> (ø)
internal/xds/translator/translator.go	78.49% <100.00%> (+0.24%)	⬆️

... and 2 files with indirect coverage changes