Post-migration clean-up for `@metamask/eth-json-rpc-provider`

[MajorLift]

Overview

After the process for migrating eth-json-rpc-provider into the packages/ directory of the core monorepo is completed, there are a few follow-up and clean-up tasks left to perform.

Tasks

Source repo

• Transfer branches/issues/PRs from the source repo into the core monorepo.
  • Blocked by Explore solutions for transferring issues and PRs from other repos into the core monorepo #1835
• Leave a note in the source repo's README announcing the migration and pointing to core.
• Sunset /latest and /staging docs on GitHub Pages (or migrate to core?).
• Archive the source repo to prevent any changes from being pushed to it going forward.

Core

• Update contents of packages/eth-json-rpc-provider/README.md to reflect new status as a non-root package in the monorepo.
• Use the yarn create-release-branch tool to publish a release of core with a new version for the migrated package and any updated downstream packages.
  • Record any changes made to packages during the migration process in their respective CHANGELOGs.
• Fix downstream errors that were marked with @ts-expect-error TODO: during the migration process.
  • Fix provider type errors in NetworkController and its downstream packages #1823

References

• Previous step in migration: eth-json-rpc-provider migration - Integration into packages/ #1738.
• See Fully migrate eth-json-rpc-provider into core monorepo  #1551 (comment) for context on the migration process.
• See Migrate libraries into core monorepo #1079 (comment) for context on the migration process.

[MajorLift]

Replacing with epic #1842