Combine constants and reuse port

[yurishkuro]

To avoid duplicating the port number

[codecov]

Codecov Report

Merging #415 into master will decrease coverage by 0.03%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #415      +/-   ##
==========================================
- Coverage   88.47%   88.44%   -0.04%     
==========================================
  Files          55       55              
  Lines        3107     3107              
==========================================
- Hits         2749     2748       -1     
- Misses        253      255       +2     
+ Partials      105      104       -1

Impacted Files	Coverage Δ
sampler.go	94.75% <100%> (ø)	⬆️
internal/baggage/remote/restriction_manager.go	95.77% <0%> (-1.41%)	⬇️

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