Fixup EntityAssociation schemaconv.schema.json

[CommCody]

Summary

The weaver registry check command expects an EntityAssociation to be a string. But the schema defines it as an array.

groups:
  - id: span.example.works_for_schema
    type: span
    span_kind: internal
    stability: development
    brief: Example working for the schema
    entity_associations:
      - [ 'entity.example']
  - id: span.example.works_for_tooling
    type: span
    span_kind: internal
    stability: development
    brief: Example working for the tooling
    entity_associations:
      - 'entity.example'

An example from the semantic-conventions repo can be found here: https://github.com/open-telemetry/semantic-conventions/blob/65f5c612261508f55800ab622a989349f29ba5ef/model/k8s/metrics.yaml#L29

The proposed change also aligns with the v2 schema

Changes

• Change the schema so it aligns with the tooling and existing definitions in the semantic-conventions repo

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: CommCody / name: Joris Goovaerts (4f5b8cb)

[jsuereth]

can you update the description to be accurate?

Also @lmolkova can you review this? I don't use the schema outside of error messages inside weaver, and It's not clear to me if this is a fix or a breakage.

[CommCody]

can you update the description to be accurate?

Fixed, apologies for the copy-paste issue

[CommCody]

Hi @jsuereth and @lmolkova

Is there anything I can do to help move this small change along?

Kind Regards,
Joris