Avoided master crash on re-registration of old agents.
Avoided master crash on re-registration of old agents.

At present, agents that are refinement-capable send their task and
executor resources in the post-refinement format, whereas older agents
use the pre-refinement format. However, the master code only converted
agent resources to post-refinement format if the agent was not
multi-role capable. This leads to a subsequent `CHECK` failure for
agents that have multi-role but not reservation-refinement capabilities.

We should instead convert to post-refinement format for all
non-refinement capable agents.

Review: https://reviews.apache.org/r/60416

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