fix: discussions not closing after 30 days of being stale

[mvadari]

High Level Overview of Change

Title says it all.

Context of Change

e.g. this discussion: #105 (comment)

Type of Change

• Infrastructure (CI, workflows, scripts, website)

[Copilot]

Pull request overview

This PR fixes a bug where stale discussions were not being closed after 30 days of inactivity. The root cause was a mismatch between how the GraphQL and REST APIs handle bot usernames (GraphQL returns without [bot] suffix, REST requires it), and an incorrect reliance on the updatedAt timestamp which gets updated by the bot's own warning comment.

Changes:

• Fixed bot login handling to use the correct format for each API (without [bot] suffix for GraphQL, with suffix for REST API verification)
• Updated discussion closing logic to check for actual non-bot user activity after warnings instead of relying on the updatedAt timestamp
• Added explanatory comments documenting the API behavior differences

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
.github/workflows/discussions.yml	Removed [bot] suffix from BOT_LOGIN environment variable to match GraphQL API format
.github/scripts/process-stale-discussions.sh	Added [bot] suffix only for REST API user verification, with comments explaining the API differences
.github/scripts/filter-discussions-to-close.jq	Changed closing criteria from checking updatedAt timestamp to counting non-bot comments after the warning, which correctly identifies discussions with no user activity

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