Update pull_request_assignment.yml remove package.json which conflict with cadl PR

[ruowan]

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[openapi-workflow-bot]

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[openapi-pipeline-app]

Swagger Validation Report

️️✔️BreakingChange succeeded [Detail] [Expand]

There are no breaking changes.

️️✔️Breaking Change(Cross-Version) succeeded [Detail] [Expand]

There are no breaking changes.

️⌛CredScan pending [Detail]

️️✔️LintDiff succeeded [Detail] [Expand]

Validation passes for LintDiff.

️️✔️Avocado succeeded [Detail] [Expand]

Validation passes for Avocado.

️️✔️ApiReadinessCheck succeeded [Detail] [Expand]

️️✔️~[Staging] ServiceAPIReadinessTest succeeded [Detail] [Expand]

Validation passes for ServiceAPIReadinessTest.

️️✔️~[Staging] SwaggerAPIView succeeded [Detail] [Expand]

️️✔️~[Staging] CadlAPIView succeeded [Detail] [Expand]

️️✔️ModelValidation succeeded [Detail] [Expand]

Validation passes for ModelValidation.

️️✔️SemanticValidation succeeded [Detail] [Expand]

Validation passes for SemanticValidation.

️⌛PoliCheck pending [Detail]

️️✔️PrettierCheck succeeded [Detail] [Expand]

Validation passes for PrettierCheck.

️️✔️SpellCheck succeeded [Detail] [Expand]

Validation passes for SpellCheck.

️️✔️Lint(RPaaS) succeeded [Detail] [Expand]

Validation passes for Lint(RPaaS).

️️✔️CadlValidation succeeded [Detail] [Expand]

Validation passes for CadlValidation.

️⌛PR Summary pending [Detail]

_{Posted by Swagger Pipeline | How to fix these errors?}

[openapi-pipeline-app]

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[openapi-pipeline-app]

Swagger pipeline started successfully. If there is ApiView generated, it will be updated in this comment.