Implement tests against the beacon-api oapi schema

### Describe the feature

![Image](https://github.com/user-attachments/assets/bc1b82ea-9505-4241-9ef1-0a245f2046dc)

https://discordapp.com/channels/595666850260713488/1352179181634584646/1352210564587192383

![Image](https://github.com/user-attachments/assets/8b1f2905-e697-4ea4-98a4-42b9aa85009d)

![Image](https://github.com/user-attachments/assets/bfb8a161-6177-4195-8c73-dbbd1de8243b)

### Links Referenced
https://github.com/ethereum/beacon-APIs/issues/402
[oapiSpec.test.ts](https://github.com/ChainSafe/lodestar/blob/unstable/packages/api/test/unit/beacon/oapiSpec.test.ts)
[test data](https://github.com/ChainSafe/lodestar/blob/unstable/packages/api/test/unit/beacon/testData/beacon.ts)
[fetching](https://github.com/ChainSafe/lodestar/blob/unstable/packages/api/test/utils/fetchOpenApiSpec.ts)
[parsing](https://github.com/ChainSafe/lodestar/blob/unstable/packages/api/test/utils/parseOpenApiSpec.ts)
[checkAgainstSpec.ts](https://github.com/ChainSafe/lodestar/blob/unstable/packages/api/test/utils/checkAgainstSpec.ts)
[ajv](https://github.com/ajv-validator/ajv)

### Additional context

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Implement tests against the beacon-api oapi schema #345

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Implement tests against the beacon-api oapi schema #345

Description

Describe the feature

Links Referenced

Additional context

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

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