Expiring flow measures

[KHardern]

Change to rules for when a flow measure needs to send discord notification, to prevent additional notifications when flow meausre numbers are quiet.

This only applies to flow measures that are expiring (i.e. not deleted/withdrawn).

For ECFMP discord, send notifications if:

• 3 or more active flow measures overlapping the +/- hour of this measure
• OR greater than 5 discord webhooks in the last 2 hours
• OR this flow measure has been edited more than once (detectable by -3 suffix or higher)

For external webhooks:

• Do not send notification on expiry

[github-actions]

🎉 This issue has been resolved in version 1.5.0 🎉

The release is available on GitHub release

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