Document silent delivery for incoming webhooks

[sbishel]

Summary

Documents the new silent field for incoming webhooks, which delivers a post to a channel without generating any notifications. Also updates the related reserved-props key lists and cross-links the mutual exclusivity with persistent notifications.

Ticket Link

Fixes: https://mattermost.atlassian.net/browse/MM-68754

Related PRs

mattermost/mattermost#36771

[github-actions]

Newest code from mattermost has been published to preview environment for Git SHA 014d407

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 800d1513-9556-410a-9ad4-4a112d7252da

📥 Commits

Reviewing files that changed from the base of the PR and between 1ce44f1 and 014d407.

📒 Files selected for processing (3)

• site/content/integrate/reference/message-priority/_index.md
• site/content/integrate/slash-commands/custom/_index.md
• site/content/integrate/webhooks/incoming/_index.md

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📝 Walkthrough

Walkthrough

Documentation updates clarify mutual exclusivity between persistent notifications and silent parameter delivery across three integration pages, and expand the list of reserved keys for the props parameter in webhook and slash command endpoints.

Changes

Integration Documentation Updates

Layer / File(s)	Summary
Persistent notifications and silent parameter documentation site/content/integrate/reference/message-priority/_index.md, site/content/integrate/webhooks/incoming/_index.md	Message priority documentation updated to specify that persistent_notifications is exclusive with the silent parameter. Incoming webhooks documentation added the silent parameter row describing silent post delivery behaviour and its mutual exclusivity with priority.persistent_notifications.
Props reserved keys documentation expansion site/content/integrate/slash-commands/custom/_index.md, site/content/integrate/webhooks/incoming/_index.md	Slash commands and incoming webhooks documentation clarified that reserved keys in the props parameter are ignored when supplied, and expanded the reserved-key list to include additional notification, from_*, and override_*-related fields.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title directly and clearly describes the main change: documenting silent delivery for incoming webhooks, which is the primary focus of the PR.
Description check	✅ Passed	The description is directly related to the changeset, explaining the new silent field, related documentation updates, and the mutual exclusivity with persistent notifications.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch bot-silent-delivery

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[github-actions]

Newest code from mattermost has been published to preview environment for Git SHA e448862