Impove FilterIdTest provider keys

follow up to #2940679: Fix FilterIdTest test names

By converting the comments for each provider data set to the keys we can improve the error output. To quote larowlan

e.g from

     // The filter ID is mapped, and the plugin exists.
      [
        'foo',
        'filter_html',
      ],

to

'filter ID mapped to plugin that exists' => [
        'foo',
        'filter_html',
      ],