Drmorr/minor scraping improvements

[drmorr0]

Description and Rationale

• Add jitter before we start scraping metrics to spread out the load

Test Steps

• make test passes

• I certify that this PR does not contain any code that has been generated with GitHub Copilot or any other AI-based code generation tool, in accordance with this project's policies.

[codecov]

Codecov Report

❌ Patch coverage is 81.81818% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.56%. Comparing base (a4d48eb) to head (aad95f9).

Files with missing lines	Patch %	Lines
sk-tracer/src/metrics/scraper.rs	33.33%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #274      +/-   ##
==========================================
+ Coverage   79.53%   79.56%   +0.02%     
==========================================
  Files          65       65              
  Lines        4172     4183      +11     
==========================================
+ Hits         3318     3328      +10     
- Misses        854      855       +1     

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