unsupported diagnostics [REQUESTS]

In M24 release branch when we try to upgrade the Central, service and DP resources, we get 400 bad request for db diagnostics.

sample error: (for DP resources., same case with central and service resources)

│ Error: updating Monitor Diagnostics Setting "db_diagnostics" for Resource "/subscriptions/8eREDACTED91cca0f/resourceGroups/osd-REDACTED-rg/providers/Microsoft.DocumentDB/databaseAccounts/osd-REDACTED-db": diagnosticsettings.DiagnosticSettingsClient#CreateOrUpdate: Failure responding to request: StatusCode=400 -- Original Error: autorest/azure: Service returned an error. Status=400 Code="BadRequest" Message="Metric category 'Requests' is not supported, supported categories are: 'AllMetrics'."
│
│   with azurerm_monitor_diagnostic_setting.db_diagnostics,
│   on diagnostics.tf line 27, in resource "azurerm_monitor_diagnostic_setting" "db_diagnostics":
│   27: resource "azurerm_monitor_diagnostic_setting" "db_diagnostics" {
│
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