Add legacy-aws to e2e

[kaovilai]

          TODO: Add legacy-aws to e2e

Originally posted by @kaovilai in #1565 (comment)

https://redhat-internal.slack.com/archives/C039LRSDC8Z/p1729628722036969 suggests using legacy-aws defaultplugin and do a fsbackup which should check for node-agent readiness.

[weshayutin]

should not be required.. as it's dupe to any oadp-1.3 job. QE will take responsibility.

[kaovilai]

requirements moved to https://issues.redhat.com/browse/OADP-5106