Load snow env vars from secret for controller

[vivek-koppuru]

Issue #, if available:

Description of changes: Adding ability to read credentials from the credentials secret provided by the capas provider in order to construct the aws client maps.

Testing (if applicable): unit testing

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[eks-distro-bot]

Skipping CI for Draft Pull Request. If you want CI signal for your change, please convert it to an actual PR. You can still manually trigger a test run with /test all

[codecov[bot]]

Codecov Report

Merging #2859 (171d010) into main (834c88e) will increase coverage by 0.52%. The diff coverage is 90.27%.

@@            Coverage Diff             @@
##             main    #2859      +/-   ##
==========================================
+ Coverage   61.57%   62.09%   +0.52%     
==========================================
  Files         323      331       +8     
  Lines       26364    26523     +159     
==========================================
+ Hits        16233    16470     +237     
+ Misses       8860     8785      -75     
+ Partials     1271     1268       -3     

Impacted Files	Coverage Δ
pkg/dependencies/factory.go	67.93% <0.00%> (+1.74%)	:arrow_up:
pkg/providers/snow/reconciler/clientbuilder.go	89.65% <89.65%> (ø)
controllers/factory.go	93.28% <100.00%> (ø)
controllers/snow_machineconfig_controller.go	90.62% <100.00%> (-0.15%)	:arrow_down:
pkg/aws/snow.go	68.96% <100.00%> (ø)
pkg/providers/snow/reconciler/credentials.go	100.00% <100.00%> (ø)
pkg/validations/createvalidations/gitops.go	70.00% <0.00%> (-8.58%)	:arrow_down:
pkg/gitops/flux/client.go	100.00% <0.00%> (ø)
...dations/upgradevalidations/preflightvalidations.go	100.00% <0.00%> (ø)
pkg/controller/clientutil/delete.go	100.00% <0.00%> (ø)
... and 15 more

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[vivek-koppuru]

Patch coverage is showing up as 100% right now because no test files are present in the package

[vivek-koppuru]

/approve

[eks-distro-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: vivek-koppuru

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[g-gaston]

/lgtm