feat: push speed optimizations

[jescalada]

Fixes #985. The profiling screenshots are in the issue discussion.

This PR reduces push times by around 50% by using the depth: 1 and singleBranch: true options in pullRemote when cloning. It also adds the stream: true option to the express-http-proxy configuration, which should help with larger pushes.

I've experimented with other optimizations to the chain actions but it seems that the majority of time is spent cloning the target repository (and therefore limited by download speeds).

I'd say storing the target repository so we only clone the entire repo once is the best option, the tradeoff being that we might need to store several GB of data for larger repos. Perhaps we could have a config option to toggle this so admins can do as they see fit?

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[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 83.72%. Comparing base (c29b56c) to head (be57ca4).
⚠️ Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
src/proxy/processors/push-action/pullRemote.ts	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1189      +/-   ##
==========================================
- Coverage   83.74%   83.72%   -0.03%     
==========================================
  Files          67       67              
  Lines        2892     2888       -4     
  Branches      366      366              
==========================================
- Hits         2422     2418       -4     
  Misses        410      410              
  Partials       60       60              

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[coopernetes]

LGTM, one minor point on the singleBranch arg.