🐛 Fixed Tiers API erroring when invalid filter passed

[allouis]

closes ENG-730
closes https://linear.app/tryghost/issue/ENG-730/

We've updated the input serializer to parse the filter, and responded with an error if it cannot be parsed correctly.

Now that it's parsed, we can pass a mongo query object through the stack, which will lend itself to better typing for this code, which is a direction we want to go in anyway. We've had to update all the internal usages of the browse method to use mongo query objects.

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ Query Error: unexpected character in filter at char 1
  (%0D%0Abms:%20bms)+ac
  -^
  Expecting 'LPAREN', 'PROP', got 'LITERAL': An unexpected error occurred, please try again. GET /ghost/api/content/tiers View Issue
• ‼️ Query Error: unexpected character in filter at char 1
  (%0Dbms:%20bms)+activ
  -^
  Expecting 'LPAREN', 'PROP', got 'LITERAL': An unexpected error occurred, please try again. GET /ghost/api/content/tiers View Issue
• ‼️ Query Error: unrecognized text "'" in filter at char 2
  ('"%27%22%3Cbmt%
  -^: An unexpected error occurred, please try again. GET /ghost/api/content/tiers View Issue

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