Description of problem:
CDI imports images of a much larger size than requested, causing DiskPressure on the node.

[test_id:2329] fails from time to time with evicted importer pods complaining about DiskPressure:
https://search.ci.kubevirt.io/?search=too+much+space&maxAge=336h&context=1&type=bug%2Bissue%2Bjunit&name=&excludeName=&maxMatches=5&maxBytes=20971520&groupBy=job

Version-Release number of selected component (if applicable):
4.14

How reproducible:
From time to time

Steps to Reproduce:
1. Create a DV requesting a much smaller size than the image size

Actual results:
From time to time DV gets created

Expected results:
Reject such images early on

Additional info:

Importer pod log:

I0516 17:00:57.575666 1 importer.go:103] Starting importer
I0516 17:00:57.575728 1 importer.go:172] begin import process
I0516 17:00:57.575808 1 http-datasource.go:392] Attempting to HEAD "http://cdi-file-host.cdi/cirros-large-virtual-size.raw.xz" via http client
I0516 17:00:57.580394 1 http-datasource.go:404] GO CLIENT: key: Server, value: [nginx/1.20.1]
I0516 17:00:57.580430 1 http-datasource.go:404] GO CLIENT: key: Date, value: [Tue, 16 May 2023 17:00:57 GMT]
I0516 17:00:57.580442 1 http-datasource.go:404] GO CLIENT: key: Content-Type, value: [text/plain]
I0516 17:00:57.580452 1 http-datasource.go:404] GO CLIENT: key: Connection, value: [keep-alive]
I0516 17:00:57.580463 1 http-datasource.go:404] GO CLIENT: key: Content-Length, value: [12340872]
I0516 17:00:57.580473 1 http-datasource.go:404] GO CLIENT: key: Last-Modified, value: [Tue, 16 May 2023 10:38:31 GMT]
I0516 17:00:57.580483 1 http-datasource.go:404] GO CLIENT: key: Etag, value: ["64635d27-bc4e88"]
I0516 17:00:57.580508 1 http-datasource.go:404] GO CLIENT: key: Accept-Ranges, value: [bytes]
I0516 17:00:57.580524 1 http-datasource.go:424] Content length: 12340872
I0516 17:00:57.580558 1 http-datasource.go:327] Attempting to get object "http://cdi-file-host.cdi/cirros-large-virtual-size.raw.xz" via http client
I0516 17:00:57.603283 1 data-processor.go:356] Calculating available size
I0516 17:00:57.603407 1 data-processor.go:368] Checking out file system volume size.
I0516 17:00:57.603444 1 data-processor.go:376] Request image size not empty.
I0516 17:00:57.603498 1 data-processor.go:381] Target size 492768256.
I0516 17:00:57.603573 1 format-readers.go:112] constructReaders: checking compression and archive formats
I0516 17:00:57.603622 1 format-readers.go:121] found header of type "xz"
I0516 17:00:57.646847 1 data-processor.go:255] New phase: TransferDataFile
I0516 17:00:57.647003 1 util.go:194] Writing data...
I0516 17:00:58.647782 1 prometheus.go:75] 73.66
I0516 17:00:59.648428 1 prometheus.go:75] 97.64
I0516 17:01:00.648879 1 prometheus.go:75] 97.76
I0516 17:01:01.649697 1 prometheus.go:75] 97.91
E0516 17:01:02.508903 1 util.go:196] Unable to write file from dataReader: write /data/disk.img: no space left on device
E0516 17:01:02.635696 1 data-processor.go:251] write /data/disk.img: no space left on device