#4269 event updating slack message

[glickgNU]

Changes

Slack notifications have their times change accordingly with their respective events change time.

Test Cases

• A scheduled event, when the time changes, the slack message changes time.
• When other settings such as teams and name of event are changes, time still changes accordingly after these changes.

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Closes #4269

[staysgt]

Just a few small comments, looks good so far!

[staysgt]

Looks good!

[wavehassman]

Great job overall!
In editScheduleSlot service, add sendEventScheduledSlackNotif after the slot update (same pattern as editEvent already uses)
In editEvent service, make the Slack notification conditional on no slot changes being pending, so only one fires:

if (status === Event_Status.SCHEDULED && foundEventType.sendSlackNotifications && scheduleSlots.length === 0) {
  await sendEventScheduledSlackNotif(...);
}

[wavehassman]

Instead of this use the editScheduleSlot service since it already updates the slots correctly