[cisco_meraki] Add feature to remove original event

[LaZyDK]

What does this PR do?

Add the ability to remove event.original when preserve_original_event is not in tags.

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.

[LaZyDK]

@P1llus test :)

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• Start Time: 2022-09-28T08:42:13.882+0000

• Duration: 18 min 57 sec

Test stats 🧪

Test	Results
Failed	0
Passed	19
Skipped	0
Total	19

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[P1llus]

/test

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Name	Metrics % (covered/total)	Diff
Packages	100.0% (2/2)	💚
Files	100.0% (9/9)	💚
Classes	100.0% (9/9)	💚
Methods	100.0% (65/65)	💚
Lines	98.851% (1118/1131)	❕
Conditionals	100.0% (0/0)	💚

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Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

[andrewkroh]

/test

[P1llus]

/test

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