Update Satellite ES to 8.4.0, ES-mock to 2.0.0

[RC-Lee]

Issue This PR Addresses

Part one of two for #2913

Type of Change

• Dependency: Update a dependency

Description

We need to update and release ElasticSearch and ElasticSearch-Mock in Satellite before we can update it in Telescope.

Using 8.4.0, as it is the latest stable version on npm

Steps to test the PR

Please note
Telescope runs fine locally, all the docker containers will build, all the posts will show, and search will function as usual.
Satellite tests will pass.
However, Search tests will break, which is caused from ES-mock being very confused in our monorepo.
But, Search tests will work fine again once Telescope is using the new Satellite, with the new ES and ES-mock.

Checklist

• Tests: This PR includes thorough tests or an explanation of why it does not

[gitpod-io]

[humphd]

Code changes look good, assuming CI is happy, r+ from me. Thanks for maintaining this!

[RC-Lee]

I just want to emphasize that Search tests are expected to break, cause ES-mock is very confused.
CI will be unhappy.
But it will be fixed once we use the new Satellite.

[humphd]

@RC-Lee apologies, I read that, and promptly wrote the opposite. Yes, break them here, fix in follow-up. Sounds good.