[Feature] Unit tests for StripHtml helper

[AustinATTS]

Is your feature request related to a problem?

No response

Describe the solution you'd like

The StripHtml() function in bready_bot.cc converts Odoo HTML messages to plain text. Extract it to a testable unit and write tests covering:

• Plain text passthrough

• ,
  should cause a newline

• , should be removed
• text should create "text(url)"
• should be the url on a newline
• HTML entities (&, <, etc.,)
• Nested tags
• Malformed HTML

Describe alternatives you've considered

No response

Additional context

No response