Azure App Service is a service used to create and deploy scalable, mission-critical web apps.
Azure WebJobs themselves have not been retired or deprecated. They remain fully supported by Microsoft.
I gather your impression might be based on one of three related retirements or changes.
The first is the retirement of Azure Scheduler. Azure Scheduler was fully shut down on December 31, 2019. Many developers used Azure Scheduler to configure and trigger Scheduled WebJobs. When Scheduler was retired, Microsoft advised migrating those specific Scheduler-based triggers to Azure Logic Apps. The WebJobs cron-schedule engine itself was not affected. Scheduled WebJobs configured through App Service with Always On continue to operate.
The second is the deprecation of the AzureWebJobsDashboard application setting. If you worked with the WebJobs SDK or legacy Azure Functions, you may remember notifications concerning this setting. It was used to output logs to a classic storage dashboard, which Microsoft phased out in favor of Azure Monitor and Application Insights. This was a change to the logging mechanism and was not a retirement of WebJobs themselves.
The third is Microsoft's broader shift toward Azure Functions and Azure Container Apps. WebJobs remain supported, but Azure Functions is the more modern serverless model and is built on the WebJobs SDK. For containerized background tasks that run for a finite duration, Azure Container Apps Jobs provide a cloud-native alternative.
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hth
Marcin