Fix Dashboard Bicep Warnings

[raafatzarka]

After updating all Biceps, there are still some warnings related to the Dashboard.bicep
Related issue: #886

WARNING: /workspace/e2e_samples/parking_sensors/infrastructure/modules/dashboard.bicep(66,19) : Warning BCP037: The property "options" is not allowed on objects of type "MarkdownPartMetadataSettingsContent". Permissible properties include "settings". If this is a resource type definition inaccuracy, report it using https://aka.ms/bicep-type-issues. [https://aka.ms/bicep/core-diagnostics#BCP037] /workspace/e2e_samples/parking_sensors/infrastructure/modules/dashboard.bicep(131,19) : Warning BCP037: The property "options" is not allowed on objects of type "MarkdownPartMetadataSettingsContent". Permissible properties include "settings". If this is a resource type definition inaccuracy, report it using https://aka.ms/bicep-type-issues. [https://aka.ms/bicep/core-diagnostics#BCP037] /workspace/e2e_samples/parking_sensors/infrastructure/modules/dashboard.bicep(196,19) : Warning BCP037: The property "options" is not allowed on objects of type "MarkdownPartMetadataSettingsContent". Permissible properties include "settings". If this is a resource type definition inaccuracy, report it using https://aka.ms/bicep-type-issues. [[https://aka.ms/bicep/core-diagnostics#BCP037]](https://aka.ms/bicep-type-issues)

DoD

Review Dashboard bicep module from the sample and fix the Warnings
Test e2e sample to verify that there is no breaking change