Remove dependency on kubectl binary

[peterbom]

Now that the OSM and SMI collectors are no longer dependent on kubectl, we can remove the binary from the Periscope image.

This removes it from the Docker image, along with other unused packages (taking the Linux image size from 161MB to 63MB).

It also updates the OSM and SMI collectors so that they will be enabled on Windows nodes.

To test manually, run Periscope from VS Code after setting the following in settings.json:

    "aks.periscope.containerRegistry": "ghcr.io/peterbom",
    "aks.periscope.imageVersion": "0.0.9",
    "aks.periscope.releaseTag": "v0.9",
    "aks.periscope.repoOrg": "peterbom",

[codecov-commenter]

Codecov Report

Merging #181 (4311a99) into master (2377183) will decrease coverage by 0.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #181      +/-   ##
==========================================
- Coverage   78.94%   78.82%   -0.12%     
==========================================
  Files          13       13              
  Lines         717      713       -4     
==========================================
- Hits          566      562       -4     
  Misses         92       92              
  Partials       59       59              

Impacted Files	Coverage Δ
pkg/collector/osm_collector.go	75.41% <ø> (-0.21%)	⬇️
pkg/collector/smi_collector.go	78.46% <ø> (-0.65%)	⬇️

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[Tatsinnit]

💡 we checked and this seems good, we dint find any code with curl dependency et. al. hence removal of this seems justifiable, if we find something we can always add it back again.

[Tatsinnit]

Also, just as note, the default of alpine shell is ash