fix(3234): Always merge parent event meta last #475
Merged
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Context
During a restart case, sometimes the metadata from parentEvent is expected but with the current implementation, the metadata from parentBuildId wins over that from a parentEvent, ending in a situation where some metadata is missing.
Objective
This PR always merges parent event meta if it exists. Order of precedence goes: build > parent event > parent build > event
References
Related to screwdriver-cd/screwdriver#3234
License
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