Add support for select statement for k8s_objects.

[Globegitter]

We are making use of --define flags to deploy targets into different environments. Right now we are making use of an alias to achieve this but it has limitations and adds code complexity that we would like to remove. Unfortunately macros can not manipulate select statements directly so I have to treat a dict as a special case. See bazelbuild/bazel#8419

[k8s-ci-robot]

Hi @Globegitter. Thanks for your PR.

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[chrislovecnm]

/ok-to-test

Looks good, a rebase would be awesome :)

[Globegitter]

@chrislovecnm rebased :)

[Globegitter]

Anything still blocking this to get this merged?

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Globegitter, nlopezgi

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[nlopezgi]

apilogies for the delay, thanks for the poke