Adding/Removing timestamps not working as expected

[whynowy]

Describe the bug

To Reproduce
Steps to reproduce the behavior:

Create a simple pipeline and check the pod logs from different vertices, try out the add/remove timestamps feature.

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
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Environment (please complete the following information):

• Kubernetes: [e.g. v1.18.6]
• Numaflow: [e.g. v0.5.1]

Additional context
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[veds-g]

The reason filtering does not work here is because unlike source and cat vertex, sink does not have an object in logs. The timestamp is extracted from the log object for source and cat, but for sink it is just a string. Can we generalise the log format so its easy to apply the filters or should I handle it separately for this sink log string (provided it remains consistent).