property CustomMetricsOptedInType not present in Microsoft.Insights/components@2020-02-02

**Bicep version**
Bicep CLI version 0.5.6 (5f2f88f0f0)

**Describe the bug**
property CustomMetricsOptedInType can be set in Microsoft.Insights/components@2020-02-02 but it is not documented. Possible values for the property are 'WithDimensions' or 'NoDimensions'.

**To Reproduce**
Steps to reproduce the behavior:

**Additional context**
Add any other context about the problem here.

Locate the type definition for Microsoft.Insights/components@2020-02-02 in this repository and inspect how its properties are represented. Add or expose CustomMetricsOptedInType with the documented WithDimensions and NoDimensions values, then verify the resource type accepts the property using the repository's available checks.

Written by the indexing model from the issue text.