Remove deprecated methods and types

[jkoenig134]

Readiness checklist

• I added/updated tests.
• I ensured that the PR title is good enough for the changelog.
• I labeled the PR.
• I self-reviewed the PR.

[jkoenig134]

We don't need to keep that technical debt anymore for v7 :)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Files with missing lines	Coverage Δ
...ationshipAttributeDeletedByPeerNotificationItem.ts	84.00% <ø> (-1.19%)	⬇️
packages/runtime/src/events/EventProxy.ts	94.01% <ø> (-0.06%)	⬇️
packages/runtime/src/events/consumption/index.ts	100.00% <ø> (ø)
...ensibility/facades/consumption/AttributesFacade.ts	99.03% <ø> (-0.05%)	⬇️
...c/extensibility/facades/transport/AccountFacade.ts	97.61% <ø> (+2.01%)	⬆️

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.