Instrumentation key EoL

**Is your feature request related to a problem? Please describe.**
azureSpringAppsMonitoringSettings required to use the AppInsights Instrumentation key :

```sh
resource azureSpringAppsMonitoringSettings 'Microsoft.AppPlatform/Spring/monitoringSettings@2022-09-01-preview' = {
name: monitoringSettingsName
parent: azureSpringApps
properties: {
appInsightsInstrumentationKey: appInsights.properties.InstrumentationKey
appInsightsSamplingRate: 10
// traceEnabled: true Indicates whether enable the trace functionality, which will be deprecated since api version 2020-11-01-preview. Please leverage appInsightsInstrumentationKey to indicate if monitoringSettings enabled or not
}
}
```

But [https://learn.microsoft.com/en-us/azure/azure-monitor/app/java-in-process-agent#set-the-application-insights-connection-string](https://learn.microsoft.com/en-us/azure/azure-monitor/app/java-in-process-agent#set-the-application-insights-connection-string) states :

_On March 31, 2025, support for instrumentation key ingestion will end. Instrumentation key ingestion will continue to work, but we'll no longer provide updates or support for the feature. Transition to connection strings to take advantage of new capabilities._

**Describe the solution you'd like**
ASA should be updated accordingly, this will impact all customers with potential outage, having to create new ASA service instances.

The sooner this change is implemented, the better it is as it would impact less customers.

**Describe alternatives you've considered**
N/A

**Additional context**
N/A