Remove temporary `src/legacy/core_plugins/expressions` eslint overrides

[spalger]

In order to move forward with #49244 we needed to disable some rules in src/legacy/core_plugins/expressions. We need to remove the related overrides and get the package passing these rules pretty soon.

// .eslintrc.js
{
  files: ['src/legacy/core_plugins/expressions/**/*.{js,ts,tsx}'],
  rules: {
    'react-hooks/exhaustive-deps': 'off',
  },
},

[elasticmachine]

Pinging @elastic/kibana-app-arch (Team:AppArch)

[ppisljar]

seems this has been done, please reopen if its still relevant