Sweep: rename user-facing text containing "Discourse" to "community forum"

[sweep-nightly]

Description

This pull request addresses the need to update user-facing text across our platform, replacing instances of "Discourse" with "community forum" to ensure clarity and improve accessibility for our users. This change aligns with our goal to make our platform more user-friendly and intuitive.

Summary

• Renamed all user-facing instances of Discourse to community forum to enhance clarity.
• Updated documentation and help pages to reflect the new terminology.
• Modified UI labels, tooltips, and error messages in various files and directories to ensure consistency across the platform.
• Conducted thorough testing to ensure that these changes do not affect the functionality of our platform.

Fixes #3743.

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Rollback Files For Sweep

• Rollback changes to sweepai/utils/previous_diff_utils.py

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