[prtester] improve prtester.py and prhtmlgenerator.yml for running in forks#4313

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User123698745 wants to merge 2 commits intoRSS-Bridge:masterfrom

User123698745:prtester-artifact-base-url

Commits on Aug 3, 2025

[prtester] support forks to upload to their own "rss-bridge-tests"
User123698745
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[prtester] review feedback: add 'github.event.number' fallback to 'none'
User123698745
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