virt_file_size: Use float in all places

[SchoolGuy]

Before there was a mix of int and float. This mix was now converted to float in
all places which is: Docs, Tests, Settings, CLI.

[SchoolGuy]

This PR should contain the forward port of V3.3.3 once the PR for #3072 is approved.

[SchoolGuy]

PR was approved. After 3.3.3 was released in the coming days, I will rebase this PR and incorporate the changes here.

[SchoolGuy]

Okay I now rebased onto main and cherry picked the commits as needed. Thus we need to put this on hold until we released 3.3.3

[codecov]

Codecov Report

Merging #3071 (ebe3a91) into main (132aefa) will decrease coverage by 0.05%.
The diff coverage is 90.47%.

@@            Coverage Diff             @@
##             main    #3071      +/-   ##
==========================================
- Coverage   62.49%   62.43%   -0.06%     
==========================================
  Files         102      103       +1     
  Lines       14491    14506      +15     
==========================================
+ Hits         9056     9057       +1     
- Misses       5435     5449      +14     

Impacted Files	Coverage Δ
cobbler/cli.py	65.13% <ø> (ø)
cobbler/settings/migrations/V3_4_0.py	92.30% <66.66%> (ø)
cobbler/settings/migrations/V3_3_3.py	93.33% <93.33%> (ø)
cobbler/items/image.py	84.47% <100.00%> (ø)
cobbler/settings/__init__.py	88.01% <100.00%> (ø)
cobbler/validate.py	83.57% <100.00%> (ø)
cobbler/autoinstall_manager.py	67.28% <0.00%> (-4.94%)	⬇️
cobbler/cobbler_collections/collection.py	74.66% <0.00%> (-0.89%)	⬇️
cobbler/items/profile.py	94.24% <0.00%> (-0.61%)	⬇️
cobbler/autoinstallgen.py	11.29% <0.00%> (-0.57%)	⬇️

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[vzhestkov]

Looks good 👍