Audit the code in the noderesources and dynamicresources scheduler plugins added for extended resource support by DRA

[klueska]

In the process of reviewing #133784, it became clear that the code protected by the DRAExtendedResource feature gate in ‎pkg/scheduler/framework/plugins/noderesources/fit.go and pkg/scheduler/framework/plugins/dynamicresources/dynamicresources.go‎ needs an audit.

It is hard to read the code top-to-bottom and verify that it is obviously correct. Before promoting to this feature to beta, we should revisit this code and make it clear / add more comments to improve its readability and verify its correctness.

/wg device-management

[k8s-ci-robot]

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[pohly]

/cc @yliaog

[yliaog]

@alaypatel07 @bitoku @bart0sh is this something you can help? i think it's better to audit the code with some fresh eyes

[alaypatel07]

I can help here. Please feel free to assign this to me. Thanks

[yliaog]

/assign @alaypatel07

thanks.