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 it's going to come from the Redocly config package soon.

Reference

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

Testing

Screenshots (optional)

Check yourself

• 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

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

[changeset-bot]

⚠️ No Changeset found

Latest commit: fc37b3d

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[github-actions]

Command	Mean [s]	Min [s]	Max [s]	Relative
redocly lint packages/core/src/benchmark/benches/rebilly.yaml	1.029 ± 0.014	1.018	1.065	1.00
redocly-next lint packages/core/src/benchmark/benches/rebilly.yaml	1.036 ± 0.022	1.000	1.079	1.01 ± 0.03

[github-actions]

Coverage report

❌ An unexpected error occurred. For more details, check console

Error: The process '/opt/hostedtoolcache/node/20.11.1/x64/bin/npm' failed with exit code 1

St.❔	Category	Percentage	Covered / Total
🟡	Statements	76.52%	4380/5724
🟡	Branches	66.87%	2351/3516
🟡	Functions	69.75%	717/1028
🟡	Lines	76.69%	4112/5362

Show files with reduced coverage 🔻

St.❔	File	Statements	Branches	Functions	Lines
🟢	... / redocly-yaml.ts	82.93% (-6.67% 🔻)	52.78% (-12.22% 🔻)	66.67% (-33.33% 🔻)	82.35% (-6.81% 🔻)

Test suite run failed

Failed tests: 1/718. Failed suites: 1/102.

  ● lint › lintConfig should work

    expect(received).toMatchInlineSnapshot(snapshot)

    Snapshot name: `lint lintConfig should work 1`

    - Snapshot  - 31
    + Received  +  0

    @@ -11,37 +11,6 @@
          "message": "Expected type `ConfigApis` (object) but got `string`",
          "ruleId": "configuration spec",
          "severity": "error",
          "suggest": [],
        },
    -   {
    -     "from": undefined,
    -     "location": [
    -       {
    -         "pointer": "#/theme/openapi/layout",
    -         "reportOnKey": false,
    -         "source": "",
    -       },
    -     ],
    -     "message": "`layout` can be one of the following only: "stacked", "three-panel".",
    -     "ruleId": "configuration spec",
    -     "severity": "error",
    -     "suggest": [],
    -   },
    -   {
    -     "from": undefined,
    -     "location": [
    -       {
    -         "pointer": "#/theme/openapi/theme/theme",
    -         "reportOnKey": true,
    -         "source": "",
    -       },
    -     ],
    -     "message": "Property `theme` is not expected here.",
    -     "ruleId": "configuration spec",
    -     "severity": "error",
    -     "suggest": [
    -       "schema",
    -       "shape",
    -     ],
    -   },
      ]

      395 |     const results = await lintConfig({ document });
      396 |
    > 397 |     expect(replaceSourceWithRef(results)).toMatchInlineSnapshot(`
          |                                           ^
      398 |       [
      399 |         {
      400 |           "from": undefined,

      at packages/core/src/__tests__/lint.test.ts:397:43
      at fulfilled (packages/core/src/__tests__/lint.test.ts:5:58)

Report generated by 🧪jest coverage report action from fc37b3d