Rename OpenAPI "tests" folder to "test"

[glen-84]

Summary of the changes (Less than 80 chars)

• Renamed the OpenAPI "tests" folder to "test", to match the other solutions.

[codecov[bot]]

Codecov Report

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

Project coverage is 79.53%. Comparing base (12cb60f) to head (ae8ab63).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #7106 +/- ## ========================================== + Coverage 76.39% 79.53% +3.13% ========================================== Files 2645 2648 +3 Lines 132626 132553 -73 ========================================== + Hits 101322 105422 +4100 + Misses 31304 27131 -4173 ``` | [Flag](https://app.codecov.io/gh/ChilliCream/graphql-platform/pull/7106/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ChilliCream) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/ChilliCream/graphql-platform/pull/7106/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ChilliCream) | `79.53% <ø> (+3.13%)` | :arrow_up: | 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=ChilliCream#carryforward-flags-in-the-pull-request-comment) to find out more.

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[github-actions[bot]]

Qodana for .NET

It seems all right 👌

No new problems were found according to the checks applied

💡 Qodana analysis was run in the pull request mode: only the changed files were checked ☁️ View the detailed Qodana report

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