fix(config): fix the parse of edge_path ENV var

[Freyskeyd]

Description

This PR fixes the parsing of the edge-path when set by env var.
It also refactors a bit how the edge binary path is created and add non regression tests.

PR Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added or updated tests that comprehensively prove my change is effective or that my feature works

[codecov]

Codecov Report

Attention: Patch coverage is 96.90722% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 72.08%. Comparing base (642203c) to head (40b7e22).
Report is 2 commits behind head on main.

❗ Current head 40b7e22 differs from pull request most recent head 1574999. Consider uploading reports for the commit 1574999 to get more accurate results

Files	Patch %	Lines
crates/topos-node/src/lib.rs	80.00%	1 Missing ⚠️
crates/topos/src/components/node/commands/init.rs	0.00%	1 Missing ⚠️
crates/topos/src/components/node/commands/up.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #482      +/-   ##
==========================================
+ Coverage   71.91%   72.08%   +0.16%     
==========================================
  Files         227      227              
  Lines       12745    12828      +83     
==========================================
+ Hits         9166     9247      +81     
- Misses       3579     3581       +2     

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