netflow,network_traffic,suricata: use dynamic field definitions

[efd6]

What does this PR do?

See title.

This is a counter proposal for #7271, #7273 and #7275.

/cc @MakoWish

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

• Fixes [Netflow] Missing ECS Field Mappings #7270
• Closes [Netflow] Missing ECS Field Mappings #7271
• Fixes [Network Traffic] Missing ECS Field Mappings #7272
• Closes [Network Traffic] Missing ECS Field Mappings #7273
• Fixes [Suricata] Missing ECS Field Mappings #7274
• Closes [Suricata] Missing ECS Field Mappings #7275

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• Start Time: 2023-09-05T03:25:53.224+0000

• Duration: 67 min 47 sec

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Test	Results
Failed	0
Passed	182
Skipped	0
Total	182

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (3/3)	💚
Files	100.0% (8/8)	💚
Classes	100.0% (8/8)	💚
Methods	99.099% (110/111)	👍 6.64
Lines	94.81% (1096/1156)	👍 3.308
Conditionals	100.0% (0/0)	💚

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

[kcreddy]

LGTM 👍🏼

[elasticmachine]

Package netflow - 2.13.0 containing this change is available at https://epr.elastic.co/search?package=netflow

[elasticmachine]

Package network_traffic - 1.22.0 containing this change is available at https://epr.elastic.co/search?package=network_traffic

[elasticmachine]

Package suricata - 2.13.0 containing this change is available at https://epr.elastic.co/search?package=suricata