feat: add open-iscsi package for iscsi csi driver

[croomes]

What type of PR is this? /kind feature

What this PR does / why we need it: Adds open-iscsi package to the base install.

Which issue(s) this PR fixes:

Fixes #

Requirements:

• [x] uses conventional commit messages
• [ ] includes documentation
• [ ] adds unit tests
• [ ] tested upgrade from previous version

Special notes for your reviewer: Adds the /sbin/iscsiadm binary, required by https://github.com/kubernetes-csi/csi-driver-iscsi.

The package has an installed size of 1,346 KB, according to https://packages.ubuntu.com/focal/open-iscsi

The package is installed on Ubuntu AKS nodes, and would allow https://learn.microsoft.com/en-us/azure/storage/elastic-san/elastic-san-connect-aks to work on Azure Linux.

Release note:

none

[coveralls]

Pull Request Test Coverage Report for Build 7046558345

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 79.095%

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Totals
Change from base Build 7042433318:	0.0%
Covered Lines:	2255
Relevant Lines:	2851

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💛 - Coveralls

[cameronmeissner]

feel free to reopen if still needed