[client] Report the remote jobs key in the MDM UI snapshot (#7485)

* [client] Report the remote jobs key in the MDM UI snapshot

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

* [client] Align the remote jobs snapshot key with the policy key

The snapshot field carried the JSON tag remoteJobsAllowed while the policy
key is allowRemoteJobs. GetConfigResponse.mDMManagedFields reports the raw
policy keys, and applyMDMRestrictions matches them against the struct's JSON
tags, so the field never turned true for a policy that set the key.

Every other field in Fields already uses its policy key as the JSON tag; this
was the only divergence.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

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Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>