fix: fixed extraction of top level named examples to not extract schema level examples

[TristanSpeakEasy]

This fixes an issues where the schema level examples were wrongly being extracted and didn't properly match the shape of the top level named examples.

This PR ensures only the right examples are extracted

[TristanSpeakEasy]

@daveshanley would appreciated a review

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.61%. Comparing base (6708cf0) to head (cb257f7).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #312 +/- ## ======================================= Coverage 99.61% 99.61% ======================================= Files 162 162 Lines 16305 16305 ======================================= Hits 16243 16243 Misses 57 57 Partials 5 5 ``` | [Flag](https://app.codecov.io/gh/pb33f/libopenapi/pull/312/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pb33f) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/pb33f/libopenapi/pull/312/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pb33f) | `99.61% <100.00%> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pb33f#carryforward-flags-in-the-pull-request-comment) to find out more.

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