fix: strip unnecessary files from Flatcar's Ignition data to save space #7184
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What type of PR is this?
/kind bug
/kind regression
What this PR does / why we need it:
The amount of data we can provision Azure VMs with is limited. Recent changes have pushed Flatcar's Ignition data over that limit. It has been including unnecessary files, such as those only used by Ubuntu, so this strips those out, bringing it under the limit again.
Requirements:
Special notes for your reviewer:
I had included this in #7125, but we now need the fix merged more urgently, as it is breaking E2E is current master.
Release note:
N/A