Oracle Support - Fix Oracle OSImage populate command.

[HanFa]

What this PR does / why we need it

This is a follow-up PR for #3376, cherry-picked from #3557

It enables concurrent import for multiple public images using waitgroup. Behavioral-wise, it infers image information such as imageURL from the OSImage CR, instead of user passing-in using the flag. After the import finishes, it will put the private image OCID, compartment and region as the fields of osimage.spec.image.ref.

Which issue(s) this PR fixes

Fixes #

Describe testing done for PR

manual build and verification.

Release note

 Oracle Support - Fix Oracle OSImage populate command.

Additional information

Special notes for your reviewer

[codecov]

Codecov Report

Merging #3854 (252bbe2) into main (c57f9ac) will decrease coverage by 0.89%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #3854      +/-   ##
==========================================
- Coverage   46.56%   45.66%   -0.90%     
==========================================
  Files         400      425      +25     
  Lines       39830    41381    +1551     
==========================================
+ Hits        18548    18898     +350     
- Misses      19584    20768    +1184     
- Partials     1698     1715      +17     

Impacted Files	Coverage Δ
cmd/cli/plugin/cluster/osimage.go	100.00% <ø> (ø)
cmd/cli/plugin/cluster/osimage_oracle.go	3.20% <0.00%> (ø)
addons/controllers/machine_controller.go	65.65% <0.00%> (-3.04%)	⬇️
cmd/cli/plugin/cluster/set_node_pool.go	14.63% <0.00%> (ø)
cmd/cli/plugin/cluster/create.go	42.22% <0.00%> (ø)
cmd/cli/plugin/cluster/delete.go	12.50% <0.00%> (ø)
cmd/cli/plugin/cluster/get_machinehealthcheck.go	11.42% <0.00%> (ø)
cmd/cli/plugin/cluster/main.go	0.00% <0.00%> (ø)
.../cli/plugin/cluster/set_machinehealthcheck_node.go	23.33% <0.00%> (ø)
cmd/cli/plugin/cluster/set_machinehealthcheck.go	23.33% <0.00%> (ø)
... and 19 more

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[XudongLiuHarold]

LGTM

[DanielXiao]

Please also add test cases to meet minimal code coverage rate