[AWS] Update sample_event.json for kinesis data stream

[kaiyan-sheng]

What does this PR do?

This PR is to update the sample_event.json file for kinesis data stream.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

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• Start Time: 2022-07-28T12:02:59.216+0000

• Duration: 41 min 27 sec

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Name	Metrics % (covered/total)	Diff
Packages	100.0% (11/11)	💚
Files	91.667% (11/12)	👎 -5.465
Classes	91.667% (11/12)	👎 -5.465
Methods	82.243% (176/214)	👎 -7.008
Lines	92.894% (2157/2322)	👍 2.293
Conditionals	100.0% (0/0)	💚

[kaiyan-sheng]

These fields are all from ECS, that's why I'm removing them into the ecs.yml file. I wonder if we should have a meta PR for doing the same thing for other data streams.

[tommyers-elastic]

thanks for this ! sounds like removing ECS fields from agent.yml across all integrations is a good idea, but don't worry about it right now. it doesn't have much impact AFAICT. i'll put something on the backlog that we can think about later.