fix: cost-limit ignore only Field Node named __schema

[M0ngi]

This PR fixes a bypass to the cost-limit plugin (in default settings) by skipping only nodes of type Field when ignoreIntrospection is set.

This will fix the following type of bypasses:

query  {
  ...__schema
}

fragment __schema on Query {
  books {
    title
    author
  }
}

query __schema {
  books {
    title
    author
  }
}

[changeset-bot]

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Latest commit: ab7d466

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.82%. Comparing base (11c682d) to head (ab7d466).

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #772      +/-   ##
==========================================
+ Coverage   91.73%   91.82%   +0.08%     
==========================================
  Files          17       17              
  Lines         375      379       +4     
  Branches      126      130       +4     
==========================================
+ Hits          344      348       +4     
  Misses         31       31              

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