Fix: polling fallback on failed websocket connection

[evchip]

Description

• Add a polling fallback for Open intent events if websocket connection fails, with some logic to prevent processing duplicate events.
• add pagerduty notifier for failed websocket

Motivation and Context

We believe the reason for some intents not being filled is the sealed bid auction's websocket connection to pick up Open intent events from the RPC provider is failing. This adds logic to still pick up the events even if the websocket fails

How Has This Been Tested?

Not tested. Will deploy and test.

Types of changes (remove all unchecked types)

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Style (style only changes)
• Docs
• Refactor (code that does not add new functionality nor fixes a bug)

Checklist:

• If my change requires a change to the documentation, I have updated the documentation accordingly, and in either case, have checked this box to attest to my assessment of this requirement with regard to my change.
• If my change requires additions or updates to any deployment scripts to ensure that the protocol is functional (Makefile, Dockerfile, Forge Script, etc.), I have made these changes, and in either case, have checked this box to attest to my assessment of this requirement with regard to my change.
• If my change requires additional test coverage, I have created those tests accordingly, and in either case, have checked this box to attest to my assessment of this requirement with regard to my change.

[kss-t1]

This has conflicts with the solution for WS outage resistance. Please merge in upstream into this branch.