Feature/cplat add az vhd improve (Azure#17999)

* update

* add PSDisk

* updates

* Differencing disk convert bug

* Update field names to match specification.

* update field to use current Size

* dynamic upload conversion on-the-fly

* update output methods, changelog

* remove shouldSupport

* update description, console output, and fix resizing.

* update output format, typos

* grammar

* suppress breaking change, no change in customer usage

* undo adding -keepConvertedResizedFile, and do not return PSDisk

* fix error

* Revert "fix error"

This reverts commit 1464d50.

* fix error

* change capitalization

* change variable name

* remove debug Console output

* resolve filePath to VHD File

* refactor/clean up code

* when synchronize fails, clean up resource then throw terminating error

* Add OS checking and warning before conversion/resizing

* adjust to follow conventions

* test and fix small error

* Update ChangeLog.md

* Update ChangeLog.md

Co-authored-by: Yabo Hu <yabhu@microsoft.com>

Author: grizzlytheodore

src/Compute/Compute/ChangeLog.md

@@ -20,6 +20,8 @@
 
 -->
 ## Upcoming Release
+* For `Add-AzVhd` upon upload failure using DirectUploadToManagedDisk parameter set, the SAS will be revoked and the created managed disk will be deleted.
+* An unresolved path can be passed in for '-LocalFilePath' for `Add-AzVhd`. The cmdlet with unresolve the path itself.
 * Added `-DataAccessAuthMode` parameter to Add-AzVhd DirectUploadToManagedDisk parameter set. 
 * Added `-EnabldUltraSSD` parameter to New-AzHostGroup.