feat: enable HTTP proxy settings for outgoing connections

[livio-a]

closes #4316

[netlify[bot]]

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🔨 Latest commit	eb87d79fb6905bc84274fb880dfe551ea1fc534f
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[codecov[bot]]

Codecov Report

Merging #4326 (eb87d79) into main (4723e91) will decrease coverage by 0.00%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #4326      +/-   ##
==========================================
- Coverage   47.07%   47.07%   -0.01%     
==========================================
  Files         622      622              
  Lines       55190    55191       +1     
==========================================
  Hits        25980    25980              
- Misses      27916    27917       +1     
  Partials     1294     1294              

Impacted Files	Coverage Δ
cmd/initialise/config.go	0.00% <0.00%> (ø)
cmd/initialise/init.go	15.62% <ø> (+0.31%)	:arrow_up:
cmd/initialise/verify_database.go	23.07% <0.00%> (ø)
cmd/initialise/verify_grant.go	28.57% <0.00%> (ø)
cmd/initialise/verify_user.go	28.57% <0.00%> (ø)
internal/command/command.go	6.00% <0.00%> (-0.13%)	:arrow_down:

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[mffap]

@livio-a please don't forget to update our docs. It might be worth being more strict with the terms proxy and reverse proxy.

[adlerhurst]

@livio-a should we only update our docs? IMO we should not implement something already existing

[adlerhurst]

closed in favour of: https://github.com/zitadel/zitadel/pull/4916