Move zpages logic for extension into the extension builder

[bogdandrutu]

Signed-off-by: Bogdan Drutu [email protected]

[bogdandrutu]

/cc @mx-psi this is the second PR extracted from #5512

[codecov]

Codecov Report

Merging #5537 (f8a674d) into main (a88d448) will increase coverage by 0.00%.
The diff coverage is 83.33%.

@@           Coverage Diff           @@
##             main    #5537   +/-   ##
=======================================
  Coverage   90.94%   90.94%           
=======================================
  Files         191      191           
  Lines       11381    11375    -6     
=======================================
- Hits        10350    10345    -5     
+ Misses        808      807    -1     
  Partials      223      223           

Impacted Files	Coverage Δ
service/service.go	46.15% <ø> (-1.35%)	⬇️
service/internal/extensions/extensions.go	83.83% <82.50%> (-1.50%)	⬇️
service/host.go	100.00% <100.00%> (ø)
service/zpages.go	76.04% <100.00%> (-0.58%)	⬇️

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