Fix security scanner findings: XSS, SSRF, and unsafe jQuery pattern

[AlexNPavel]

• Use html.EscapeString instead of template.HTMLEscapeString for user input in http_compare.go (XSS, HIGH)
• Validate issue_key and comment_id formats before URL interpolation in bot_comments_cleaner.py (SSRF, MEDIUM)
• Route string selectors through document.querySelectorAll in jquery.dataTables.js to prevent HTML interpretation (LOW)
• Add pycache/ to .gitignore

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/test security

[AlexNPavel]

/test security

[AlexNPavel]

/test all

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AlexNPavel, bradmwilliams

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