Introduce Deployment Stack Cancel API

**Describe the bug**
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**To Reproduce**
Steps to reproduce the behavior:
Not Sure

**Expected behavior**
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The deployment continues

**Screenshots**
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**Repro Environment**
Host OS:
Powershell Version:

**Server Debugging Information**
Correlation ID: 0539ace2-7b05-4fef-9395-a65f622a8668
Tenant ID: 2312ca0e-466f-4d78-8656-2477cf84e2d4
Timestamp of issue (please include time zone): 2025-09-11T14:57:35.2466948Z
Data Center (eg, West Central US, West Europe): West Europe

**Additional context**
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Our deploymentstack is completely stuck in the Initializing status.
I cannot delete the stack, Is there an api i can call to mark the deployment stack as failed?