Automated cherry pick of #2265: [workload] Allow specifying PodSetUpdates for a subset of PodSets

[trasc]

Cherry pick of #2265 on release-0.6.
#2265: Allow specifying PodSetUpdates for subset of
For details on the cherry pick process, see the cherry pick requests page.

Fix support for MPIJobs when using a ProvisioningRequest engine that applies updates only to worker templates.

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[trasc]

/assign @tenzen-y

[tenzen-y]

/release-note-edit

Fix support for MPIJobs when using a ProvisioningRequest engine that applies updates only to worker templates.

[tenzen-y]

/retitle Automated cherry pick of #2265: [workload] Allow specifying PodSetUpdates for a subset of PodSets

[tenzen-y]

Thank you!
/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 16e943f2d5fc956cf37329d43c58eb91bd9c5b52

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tenzen-y, trasc

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[alculquicondor]

/kind bug