chore: do not override theme.openapi with ConfigReferenceDocs node type

[tatomyr]

What/Why/How?

Getting rid of overwriting theme.openapi with the ConfigReferenceDocs node type as it's going to come from the Redocly config package soon. Essentially, it removes the Reference Docs highlighting in redocly.yaml's theme.openapi (after these changes to the Redocly config package released it is restricted to the new syntax). The validation still be present inside the deprecated features.openapi field though.

Reference

Related changes in the Redocly config package: https://github.com/Redocly/redocly/pull/8628

Testing

Screenshots (optional)

Check yourself

• [x] Code changed? - Tested with redoc/reference-docs/workflows (internal)
• [ ] All new/updated code is covered with tests
• [ ] New package installed? - Tested in different environments (browser/node)

Security

• [x] Security impact of change has been considered
• [x] Code follows company security practices and guidelines

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: d8d903ca4f7b1313e77f8436e0ec387d30e5b42e

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

This PR includes changesets to release 2 packages

| Name | Type | | --------------------- | ----- | | @redocly/openapi-core | Minor | | @redocly/cli | Minor |

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[github-actions[bot]]

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
redocly lint packages/core/src/benchmark/benches/rebilly.yaml	973.6 ± 45.4	938.2	1082.4	1.00
redocly-next lint packages/core/src/benchmark/benches/rebilly.yaml	974.6 ± 16.3	949.4	1005.4	1.00 ± 0.05

[github-actions[bot]]

Coverage report

St.:grey_question:	Category	Percentage	Covered / Total
🟡	Statements	77.12%	4475/5803
🟡	Branches	67.45%	2472/3665
🟡	Functions	70.53%	742/1052
🟡	Lines	77.3%	4209/5445

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| File | Statements | Branches | Functions | Lines | | :----------------------------------------------------------------------------------------------------------------------------------------------------: | :------------------------------------------------------------------------ | :------------------------------------------------------------- | :----------------------------------------------------------- | :------------------------------------------------------------ | :------------------------------------------------------------ | | 🟢 |

`...` / redocly-yaml.ts

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83.06% (-6.62% 🔻)

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52.78% (-12.22% 🔻)

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66.67% (-33.33% 🔻)

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82.5% (-6.76% 🔻)

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Test suite run success

738 tests passing in 102 suites.

Report generated by 🧪jest coverage report action from d8d903ca4f7b1313e77f8436e0ec387d30e5b42e