Remove CloseableBackgroundDispatcher

[martinbonnin]

Dispatchers.Default.limitedParallelism(1) is a better replacement that doesn't need lifecycle management

[svc-apollo-docs]

✅ Docs Preview Ready

Configuration

{
  "repoOverrides": {
    "apollographql/apollo-kotlin@main": {
      "remote": {
        "owner": "apollographql",
        "repo": "apollo-kotlin",
        "branch": "remove-closeable-dispatcher"
      }
    }
  }
}

Name	Link
Commit	956b8a0
Preview	https://www.apollographql.com/docs/deploy-preview/057bd2076bb73c931103
Build ID	057bd2076bb73c931103
File Changes	0 new, 12 changed, 0 removed * graphos/reference/router/telemetry/instrumentation/standard-instruments.mdx * graphos/reference/router/rhai.mdx * graphos/reference/router/errors.mdx * graphos/reference/router/configuration.mdx * graphos/routing/customization/coprocessor.mdx * graphos/routing/customization/overview.mdx * graphos/routing/observability/subgraph-error-inclusion.mdx * graphos/routing/observability/client-id-enforcement.mdx * graphos/routing/performance/caching/entity.mdx * graphos/routing/security/authorization.mdx * graphos/routing/security/request-limits.mdx * graphos/routing/self-hosted/containerization/index.mdx
Pages	12

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12 pages published. Build will be available for 30 days.

[BoD]

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