[BUG] OVF uploads not aborted on error

[Xiol]

Describe the bug
If an error occurs during OVF upload, the NFC lease isn't aborted, leading to the upload remaining in vCenter until it times out.

To Reproduce
Steps to reproduce the behavior:

1. Use importer.Import to import an OVF to a vCenter.
2. Cause an error to occur during the upload resulting in importer.Import failing to upload files.
3. Note the upload remains in vCenter.

Expected behavior
On an upload error, the lease should be aborted.

Affected version
v0.43.0

Screenshots/Debug Output

Additional context
N/A

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