Add default comment and defaulting logic for TaskSpec.MinAvailable

[SuyashParmar]

This PR adds a comment to TaskSpec.MinAvailable indicating it defaults to the task's Replicas, and implements a Default() method to set MinAvailable to Replicas if unset.

[volcano-sh-bot]

Welcome @SuyashParmar!

It looks like this is your first PR to volcano-sh/apis.

Thank you, and welcome to Volcano. :smiley:

[volcano-sh-bot]

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[Monokaix]

Please also execute bash ./hack/update-codegen.sh.

[SuyashParmar]

Please also execute bash ./hack/update-codegen.sh.

done, ran successfully

[Monokaix]

Please also execute bash ./hack/update-codegen.sh.

done, ran successfully

And there is no CRD definition changed, so seems the default value will not be set automatically.