Enable reporting of MV2 to MV3 extension.

[jonathanKingston]

Reviewer:

Description:

Reuse onBeforeRequest reporting flow for MV3, this means we need to retain feature parity.

It was deemed that the reporting APIs provided by MV3 were not suitable for our needs due to the cadence they come in.

See: https://app.asana.com/0/0/1202842358783023/f

Steps to test this PR:

Automated tests:

• Unit tests
• Integration tests

Reviewer Checklist:

• Ensure the PR solves the problem
• Review every line of code
• Ensure the PR does no harm by testing the changes thoroughly
• Get help if you're uncomfortable with any of the above!
• Determine if there are any quick wins that improve the implementation

PR Author Checklist:

• Get advice or leverage existing code
• Agree on technical approach with reviewer (if the changes are nuanced)
• Ensure that there is a testing strategy (and documented non-automated tests)
• Ensure there is a documented monitoring strategy (if necessary)
• Consider systems implications

[shakyShane]

🚀