fix(api/timeline): fix corner cases missed, add tests

[anshbansal]

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• The PR conforms to DataHub's Contributing Guideline (particularly Commit Message Format)
• Links to related issues (if applicable)
• Tests for the changes have been added/updated (if applicable)
• Docs related to the changes have been added/updated (if applicable). If a new feature has been added a Usage Guide has been added for the same.
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[pedro93]

Can we add a check that Map.keys().size is that same as the array size?
In other words confirm that there are no duplicate fieldPaths?

[anshbansal]

Why would that be necessary in a change event generator? Seems more like a validation to be done during ingestion time.