Add support for Compute/Image and Compute/Snapshot

[theunrepentantgeek]

What this PR does / why we need it:

Adds support for two new resources - Compute/Image and Compute/Snapshot.

Closes #2057

How does this PR make you feel:

If applicable:

• this PR contains tests

[codecov-commenter]

Codecov Report

Merging #2090 (3ab5639) into main (d995cb4) will decrease coverage by 0.03%.
The diff coverage is 56.95%.

@@            Coverage Diff             @@
##             main    #2090      +/-   ##
==========================================
- Coverage   56.33%   56.30%   -0.04%     
==========================================
  Files         554      562       +8     
  Lines      103002   105195    +2193     
==========================================
+ Hits        58027    59227    +1200     
- Misses      37786    38581     +795     
- Partials     7189     7387     +198     

Impacted Files	Coverage Δ
...ompute/customizations/image_extension_types_gen.go	0.00% <0.00%> (ø)
...ute/customizations/snapshot_extension_types_gen.go	0.00% <0.00%> (ø)
...api/compute/v1alpha1api20210701/image_types_gen.go	52.38% <ø> (ø)
...alpha1api20200930/snapshots__spec_arm_types_gen.go	33.33% <33.33%> (ø)
.../v1alpha1api20210701/images__spec_arm_types_gen.go	33.33% <33.33%> (ø)
...ha1api20201201storage/virtual_machine_types_gen.go	55.69% <54.00%> (-2.93%)	⬇️
.../compute/v1alpha1api20200930/snapshot_types_gen.go	56.91% <56.91%> (ø)
...e/v1alpha1api20200930storage/snapshot_types_gen.go	58.62% <58.62%> (ø)
...pute/v1alpha1api20210701storage/image_types_gen.go	58.62% <58.62%> (ø)
...2/internal/controllers/controller_resources_gen.go	86.17% <88.88%> (+0.07%)	⬆️
... and 4 more

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[matthchr]

minor: Extra newline here that looks unneeded?

[matthchr]

minor: Most tests we try to do a patch/update section too (just to ensure patch/update works and catch any possible issues in the RP like what @babbageclunk found where they didn't accept PUT for update). See for example the crd_networking_publicip_test.go

[theunrepentantgeek]

I didn't find any properties that could be patched after the initial create.

[matthchr]

You can almost always patch Tags, but it's not all that interesting since we use that trick in lots of other places already so it's unlikely it's going to be broken for just this resource. I'm fine with no Patch here.

[matthchr]

Same comment, assert on a few key properties (disk size?)

[theunrepentantgeek]

Added asserts.