Migration from App Insights Instrumentation Keys to Connection Strings

https://github.com/Azure/azure-quickstart-templates/blob/e6aea578a33cd51549f06cb3d2f7e56b53c5b14b/quickstarts/microsoft.web/web-app-loganalytics/azuredeploy.json#L94

The referenced deployment uses instrumentation keys to connect to Azure Monitor. [Instrumentation keys are being deprecated in favor of connection strings](https://learn.microsoft.com/en-us/azure/azure-monitor/app/migrate-from-instrumentation-keys-to-connection-strings).

Open quickstarts/microsoft.web/web-app-loganalytics/azuredeploy.json at line 94 and read the linked Azure Monitor migration guidance first. Update the deployment so it uses a connection string rather than an instrumentation key; the template is done when that referenced deployment no longer relies on the deprecated setting.

Written by the indexing model from the issue text.