chore(nano): config for nano-testnet-bravo

[jansegre]

Motivation

Preparation for nano-testnet-bravo that replaces nano-testnet-alpha.

Acceptance Criteria

• Update nano_testnet.yml/py configs
• Adjust CLI builder
• Adjust genesis tests

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[github-actions]

Bencher Report

Branch	chore/nano-testnet-bravo
Testbed	ubuntu-22.04

Click to view all benchmark results

Benchmark	Latency	Benchmark Result minutes (m) (Result Δ%)	Lower Boundary minutes (m) (Limit %)	Upper Boundary minutes (m) (Limit %)
sync-v2 (up to 20000 blocks)	📈 view plot 🚷 view threshold	1.73 m (+5.74%) Baseline: 1.64 m	1.47 m (85.11%)	1.80 m (96.13%)

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 85.64%. Comparing base (319605e) to head (a7020b7).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
hathor/builder/cli_builder.py	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1306      +/-   ##
==========================================
+ Coverage   85.57%   85.64%   +0.06%     
==========================================
  Files         426      426              
  Lines       31940    31940              
  Branches     4961     4961              
==========================================
+ Hits        27333    27355      +22     
+ Misses       3603     3589      -14     
+ Partials     1004      996       -8     

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