netflow,netscout,netskope,o365,okta: remove duplicate fields

[efd6]

What does this PR do?

This removes duplicate field definitions.

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

• For sei: multiple packages with duplicated field definitions #4398

Screenshots

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💚 Build Succeeded

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Build stats

• Start Time: 2022-11-14T05:38:38.774+0000

• Duration: 16 min 19 sec

Test stats 🧪

Test	Results
Failed	0
Passed	249
Skipped	0
Total	249

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🚀 Benchmarks report

Package netflow 👍(0) 💚(0) 💔(1)

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Data stream	Previous EPS	New EPS	Diff (%)	Result
log	41666.67	27777.78	-13888.89 (-33.33%)	💔

Package netscout 👍(0) 💚(0) 💔(1)

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Data stream	Previous EPS	New EPS	Diff (%)	Result
sightline	142857.14	35714.29	-107142.85 (-75%)	💔

Package netskope 👍(0) 💚(0) 💔(2)

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Data stream	Previous EPS	New EPS	Diff (%)	Result
alerts	1923.08	1349.53	-573.55 (-29.82%)	💔
events	2624.67	1623.38	-1001.29 (-38.15%)	💔

Package o365 👍(0) 💚(0) 💔(1)

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Data stream	Previous EPS	New EPS	Diff (%)	Result
audit	2207.51	853.97	-1353.54 (-61.32%)	💔

Package okta 👍(0) 💚(0) 💔(1)

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Data stream	Previous EPS	New EPS	Diff (%)	Result
system	1356.85	673.4	-683.45 (-50.37%)	💔

To see the full report comment with /test benchmark fullreport

[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (6/6)	💚
Files	100.0% (6/6)	💚 2.53
Classes	100.0% (6/6)	💚 2.53
Methods	97.403% (75/77)	👍 6.522
Lines	86.952% (1866/2146)	👎 -4.743
Conditionals	100.0% (0/0)	💚

[elasticmachine]

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