Clean up linting dependencies

[jryans]

We should reorganise and clean up our linting dependencies a bit:

• Remove typescript as a dep from the eslint-config-matrix-org repo, as it's unneeded there (can't do it, seemingly needed at both levels)
• Decide whether the plugin or downstream layers should host React linting deps (downstream layers)
• Change to renamed @babel/eslint-parser and @babel/eslint-plugin packages
• Migrate the linting deps to Element layers and away from eslint-config-matrix-org repo, since it's too confusing to manage them in the linting repo
  • Migrate JS SDK layer
  • Migrate React SDK layer
  • Migrate Element Web layer
  • Migrate Element Desktop layer