Remove "postinstall: tsc" from package.json

[mikeharder]

• Causing pipeline failures due to build errors from scripts in openapi-alps repo
• Added in Update prettier version and normalize all files #23763 to improve the experience on local dev machines

[openapi-workflow-bot]

Hi, @mikeharder Thanks for your PR. I am workflow bot for review process. Here are some small tips.

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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 succeeded [Detail] [Expand]

There is no credential detected.

️️✔️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.

️️✔️SwaggerAPIView succeeded [Detail] [Expand]

️️✔️CadlAPIView succeeded [Detail] [Expand]

️️✔️TypeSpecAPIView succeeded [Detail] [Expand]

️️✔️ModelValidation succeeded [Detail] [Expand]

Validation passes for ModelValidation.

️️✔️SemanticValidation succeeded [Detail] [Expand]

Validation passes for SemanticValidation.

️️✔️PoliCheck succeeded [Detail] [Expand]

Validation passed for PoliCheck.

️️✔️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.

️️✔️TypeSpec Validation succeeded [Detail] [Expand]

Validation passes for TypeSpec Validation.

️️✔️PR Summary succeeded [Detail] [Expand]

Validation passes for Summary.

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

[openapi-pipeline-app]

Swagger pipeline restarted successfully, please wait for status update in this comment.

[openapi-pipeline-app]

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