Backport of cli: ignore VaultToken when generating job diff into release/1.3.x

[hc-github-team-nomad-core]

Backport

This PR is auto-generated from #14424 to be assessed for backporting due to the inclusion of the label backport/1.3.x.

The below text is copied from the body of the original PR.

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Backport only to 1.3.x because that's when -vault-token flag was added to the plan command.

From our docs:

This token is cleared from the job after validating and cannot be used within the job executing environment.

So the token shouldn't be considered in the diff as it's not used internally.

Closes #14423

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