fix: gracefully handle invalid schema type in experimental parser

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🦋 Changeset detected

Latest commit: 785480b2d5f96a681dfc1f7f0fb626f744bb221f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ------------------- | ----- | | @hey-api/openapi-ts | Patch |

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Codecov Report

Attention: Patch coverage is 34.28571% with 23 lines in your changes missing coverage. Please review.

Project coverage is 66.81%. Comparing base (a993b8e) to head (785480b). Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...ages/openapi-ts/src/openApi/3.0.x/parser/schema.ts	0.00%	12 Missing :warning:
...ages/openapi-ts/src/openApi/3.1.x/parser/schema.ts	50.00%	6 Missing :warning:
...es/openapi-ts/src/plugins/@hey-api/types/plugin.ts	54.54%	5 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1309 +/- ## ========================================== - Coverage 66.88% 66.81% -0.07% ========================================== Files 136 136 Lines 20215 20244 +29 Branches 1797 1799 +2 ========================================== + Hits 13520 13527 +7 - Misses 6691 6713 +22 Partials 4 4 ``` | [Flag](https://app.codecov.io/gh/hey-api/openapi-ts/pull/1309/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=hey-api) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/hey-api/openapi-ts/pull/1309/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=hey-api) | `66.81% <34.28%> (-0.07%)` | :arrow_down: | 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=hey-api#carryforward-flags-in-the-pull-request-comment) to find out more.

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