Template field support for configmaps in the KubernetesPodOperator

[vizeit]

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Currently configmaps are not supported in the template fields in the KubernetesPodOperator. It will be helpful to add this support to dynamically attach configmaps to a pod. This change adds support for template field for configmaps

closes: #36888

[boring-cyborg]

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[dirrao]

Nice work. LGTM.

[eladkal]

We need to make sure this PR doesn't add extra work for #36484
cc @romsharon98

[romsharon98]

We need to make sure this PR doesn't add extra work for #36484 cc @romsharon98

Checked it, looks good.

[hussein-awala]

Looks good, LGTM

[boring-cyborg]

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