[PR] Add `Hypervisor default` as cache mode for disk offerings [cloudstack]

[via GitHub]

hsato03 opened a new pull request, #10282:
URL: https://github.com/apache/cloudstack/pull/10282

   ### Description
   
   Currently, ACS provides `none`, `write-back` and `write-through` options as 
cache mode when creating disk offerings. 
   
   This PR adds the option `Hypervisor default` as an alternative to cache 
mode. By using this option, the KVM hypervisor will choose the cache mode to be 
used by the disk.
   
   ### Types of changes
   
   - [ ] Breaking change (fix or feature that would cause existing 
functionality to change)
   - [ ] New feature (non-breaking change which adds functionality)
   - [ ] Bug fix (non-breaking change which fixes an issue)
   - [X] Enhancement (improves an existing feature and functionality)
   - [ ] Cleanup (Code refactoring and cleanup, that may add test cases)
   - [ ] build/CI
   - [ ] test (unit or integration test code)
   
   ### Feature/Enhancement Scale or Bug Severity
   
   #### Feature/Enhancement Scale
   
   - [ ] Major
   - [X] Minor
   
   ### Screenshots (if appropriate):
   
   <details>
   <summary>Disk offering creation</summary>
   
   ![Screenshot from 2025-01-27 
12-13-00](https://github.com/user-attachments/assets/a8a1940a-3542-46dd-8cb1-fe0185304d10)
   
   </details>
   
   <details>
   <summary>Compute offering with compute only disk offering creation</summary>
   
   ![Screenshot from 2025-01-27 
12-14-10](https://github.com/user-attachments/assets/7aab2680-c62e-4f75-949e-c510c1c3a4bf)
   
   </details>
   
   ### How Has This Been Tested?
   
   1. I created a disk offering and a compute offering with compute only disk 
offering using the `Hypervisor default` as cache mode;
   2. I deployed a VM for each offering from step 1;
   3. I verified through `virt-manager` that the disk of both VMs was using the 
`Hypervisor default` cache mode, as in the screenshot below.
   
   ![Screenshot from 2025-01-27 
12-23-58](https://github.com/user-attachments/assets/94ebc3c7-4bd0-4a41-8e4c-ed056c214512)
   


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