Update mgmt template for JS

[v-jiaodi]

A minor fix for JS template to remove un-necessary option.

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API Change Check

APIView identified API level changes in this PR and created the following API reviews

Language	API Review for Package
Go	sdk/resourcemanager/contoso/armcontoso
JavaScript	@azure/arm-contoso

[raych1]

Please ensure this change is applied to the tsp init template too, thanks.

[maririos]

You also need to update:

• JS documentation: https://github.com/Azure/azure-sdk-for-js/blob/main/documentation/Generate-code-from-TypeSpec.md
  (it might be easier to just remove the configuration properties from this file and just point them to the template, so you don't have to keep updating both places)
• I am not sure about this rule in tsp validation? https://github.com/Azure/azure-rest-api-specs/blob/main/eng/tools/typespec-validation/src/rules/sdk-tspconfig-validation.ts#L169

[MaryGao]

There is no need for validation rule. @jiaodi Could you share prs to update tsp init template and js docs in sdk repo?