Resolving objectives issue introduced with introduction of pass search

[shaahji]

Resolving objectives issue introduced with introduction of pass search

Olive allows multiple passes under the "passes" key in config where each entry can have dictate its own evaluator config i.e. the evaluation config to use for that specific pass. However, with pass search, this becomes an issue because each pass within the group can dictate conflicting objectives and goals. Circumventing the issue by collecting all the objectives across the group with the last one in the list winning if named the same. Also, handle the case where not all objectives are generated as part of the
post evaluation signal.

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• Add unit tests for this change.
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