Remove translations from Core

[frenck]

Proposed change

This PR removes the translation files from Home Assistant Core.

It is being replaced by our translation compiler for development. This will provide English translations, which is sufficient for most tasks.

Main goals:

• No longer have to sync translations each night, instead, we are fetching them at build time. This has been in production in nightly builds since Download/Update translations on build #87289.
• No need for developers to take them into account anymore when creating PRs
• Removes confusion on where to edit translations (users keep submitting PRs to this repository)
• Allows us to enable additional branch protections (as the nightly translations sync job prevented us from doing so).
• Each patch and beta version, will now also have the latest translations.

If one needs all translations, they can be downloaded using the python -m script.translations download command locally.

Changes in this PR:

• All vscode tasks and launchers, and setup scripts have been adjusted to compile languages, to ensure in normal workflow, they are "just" there.
• The test workflow now compiles translations before run.
• .gitignore has been adjusted to exclude all translation folders.
• Workflow for downloading translations has been removed.
• A couple of tests needed adjustment (because they were testing "old" style state translations, which aren't used in our codebase anymore).

This PR is huge (due to deletions), and consists of multiple PRs for reviewing purposes. If you look at it commit by commit, it is actually pretty OK. The one large commit is the removal, I've run the following command, and committed the result for that commit:

rm -f -r ./homeassistant/components/*/translations

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• The code has been formatted using Black (black --fast homeassistant tests)
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• For the updated dependencies - a link to the changelog, or at minimum a diff between library versions is added to the PR description.
• Untested files have been added to .coveragerc.

To help with the load of incoming pull requests:

• I have reviewed two other open pull requests in this repository.

[balloob]

🔥 🔥 🔥 🔥