Use keyDirective() for entity detection

[clenfest]

For entity detection, make sure we're using the keyDirective as it appears in the subgraph schema

fixes #3187

[svc-apollo-docs]

✅ Docs Preview Ready

Configuration

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    "apollographql/federation@main": {
      "remote": {
        "owner": "apollographql",
        "repo": "federation",
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Name	Link
Commit	1f04295
Preview	https://www.apollographql.com/docs/deploy-preview/d5934e3c4e9590875b0d
Build ID	d5934e3c4e9590875b0d
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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