refactor: Migrate to use Azure SDK clients

[helayoty]

Migrate to use containersClient, ContainerGroupClient, and LocationClient instead of the custom clients.

Old code:

• https://github.com/virtual-kubelet/azure-aci/blob/master/client
• https://github.com/virtual-kubelet/azure-aci/blob/master/client/client.go
• https://github.com/virtual-kubelet/azure-aci/blob/master/client/environments.go
• https://github.com/virtual-kubelet/azure-aci/blob/master/provider/aci.go#L261-L299
• https://github.com/virtual-kubelet/azure-aci/blob/master/provider/aci.go#L522-L650

[codecov-commenter]

Codecov Report

Merging #301 (865fa2e) into master (9410bd8) will decrease coverage by 1.34%.
The diff coverage is 9.45%.

❗ Current head 865fa2e differs from pull request most recent head d30179f. Consider uploading reports for the commit d30179f to get more accurate results

@@            Coverage Diff             @@
##           master     #301      +/-   ##
==========================================
- Coverage   42.79%   41.45%   -1.35%     
==========================================
  Files          35       36       +1     
  Lines        3491     3638     +147     
==========================================
+ Hits         1494     1508      +14     
- Misses       1816     1949     +133     
  Partials      181      181              

Impacted Files	Coverage Δ
provider/aci.go	36.21% <0.00%> (ø)
pkg/auth/auth.go	9.52% <9.52%> (ø)

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