feat: [VmMigration] add adaptation modifiers and storage pools to MigratingVM target defaults (#8740)

* feat: add adaptation modifiers and storage pools to MigratingVM target defaults
feat: add adaptation modifiers and guest OS features to ImageImport target details
docs: A comment for method `CancelImageImportJob` in service `VmMigration` is changed
docs: A comment for message `DataDiskImageImport` is changed

PiperOrigin-RevId: 832917413

Source-Link: googleapis/googleapis@aeb84bb

Source-Link: googleapis/googleapis-gen@6e95d84
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VmMigration/metadata/V1/Vmmigration.php

@@ -31,7 +31,7 @@
 use Google\Rpc\Status;
 
 /**
- * Initiates the cancellation of a running clone job.
+ * Initiates the cancellation of a running ImageImportJob.
  *
  * @param string $formattedName The image import job id. Please see
  *                              {@see VmMigrationClient::imageImportJobName()} for help formatting this field.