Revert "add author, space, and environment context to notifications" [ES-557]

[Lisa White (whitelisab)]

ES-557

Summary

• Reverts feat(slack): add author, space, and environment context to notifications [AIS-323] #11167 and fix(slack): resolve actor name via direct user lookup instead of paginated list[ES-557] #11263, returning Slack entry-event notifications to their pre-Aug-3 format (no author/space/environment attribution — just the entry, content type, and date).
• Why: feat(slack): add author, space, and environment context to notifications [AIS-323] #11167 added author name + space name + environment to notifications, but this can never actually resolve to a name. The Slack app authenticates via App Identity, and App Access Tokens don't have permission to read User or Space entities at all.
• Decision made: revert rather than keep showing raw IDs, so a clean two-commit revert (570c159, ae3cf48) of exactly the three files feat(slack): add author, space, and environment context to notifications [AIS-323] #11167/fix(slack): resolve actor name via direct user lookup instead of paginated list[ES-557] #11263 touched — no unrelated changes, no conflicts with the unrelated frontend fix in fix(slack): delete correct notification row instead of the last one [] #11264.

Test plan

• npm test in apps/slack/lambda passes — assertions should match the pre-feat(slack): add author, space, and environment context to notifications [AIS-323] #11167 test suite
• Trigger a publish/unpublish/create/delete event against a test space and confirm the Slack message matches the pre-Aug-3 format (no author/space/environment line)

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