feat(cli): early protection for invalid prometheus prefix

[jansegre]

Motivation

We had a report from someone accidentally using an invalid prefix through HATHOR_PROMETHEUS_PREFIX which had a message that was hard to understand.

Acceptance Criteria

• Check for invalid Prometheus prefix when building and give a more helpful message.

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	Thu, August 15, 2024 at 13:06:32 UTC
Project	hathor-core
Branch	feat/invalid-prometheus-prefix-protection
Testbed	ubuntu-22.04

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Benchmark	Latency	Latency Results nanoseconds (ns) | (Δ%)	Latency Lower Boundary nanoseconds (ns) | (%)	Latency Upper Boundary nanoseconds (ns) | (%)
sync-v2 (up to 20000 blocks)	✅ (view plot)	104,169,901,037.00 (-9.03%)	91,611,202,847.68 (87.94%)	137,416,804,271.52 (75.81%)

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[codecov]

Codecov Report

Attention: Patch coverage is 81.81818% with 2 lines in your changes missing coverage. Please review.

Project coverage is 84.86%. Comparing base (445be1c) to head (79c03e9).
Report is 2 commits behind head on master.

Files	Patch %	Lines
hathor/builder/resources_builder.py	81.81%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1107      +/-   ##
==========================================
- Coverage   84.87%   84.86%   -0.01%     
==========================================
  Files         315      315              
  Lines       24059    24070      +11     
  Branches     3644     3647       +3     
==========================================
+ Hits        20419    20428       +9     
- Misses       2927     2929       +2     
  Partials      713      713              

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