netskope: remove netskope.events.region and netskope.events.region.id

[efd6]

What does this PR do?

Removes netskope.events.region and netskope.events.region.id. These fields are not used and cause a mapping conflict.

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.

Author's Checklist

• [ ]

How to test this PR locally

Related issues

• Closes [netskope] Conflicting definition of netskope.events.region #6705

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• Start Time: 2023-07-06T01:58:25.311+0000

• Duration: 16 min 11 sec

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Test	Results
Failed	0
Passed	22
Skipped	0
Total	22

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (2/2)	💚
Files	100.0% (2/2)	💚 2.849
Classes	100.0% (2/2)	💚 2.849
Methods	100.0% (30/30)	💚 7.817
Lines	98.009% (2314/2361)	👍 6.192
Conditionals	100.0% (0/0)	💚

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

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Package netskope - 1.9.1 containing this change is available at https://epr.elastic.co/search?package=netskope