Release gates to check if particular stage is successed or failed

How about this:

1. Create the Verification Endpoint
You can use an Azure Function or any REST API that:
•    Accepts a request from Azure DevOps.
•    Checks whether the previous stage was deployed (e.g., by checking a flag in a database, a file on disk, or a deployment log).
•    Returns a JSON response like: 

{
  "status": "succeeded"
}

2. Configure the Gate in Azure DevOps
•    Go to your release pipeline.
•    Select the stage you want to protect.
•    Under Pre-deployment conditions, click Add under Gates.
•    Choose Invoke REST API or Azure Function.
•    Provide the endpoint URL and authentication details.
•    Set the success criteria, such as: 

eq(root['status'], 'succeeded')

3. Tune Gate Settings
•    Set the evaluation interval (how often it checks).
•    Set the timeout (how long it waits before failing).
•    Optionally, add approvals or manual interventions.