network_traffic: remove beta tags on data streams and add flow tests

[efd6]

What does this PR do?

Removes the beta tags from each of the integrations data streams.

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 [Network Packet Capture] Flow Metrics not reported properly  #5771

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• Start Time: 2023-04-05T23:34:35.595+0000

• Duration: 76 min 42 sec

Test stats 🧪

Test	Results
Failed	0
Passed	178
Skipped	0
Total	178

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (0/0)	💚
Files	100.0% (0/0)	💚
Classes	100.0% (0/0)	💚
Methods	75.0% (48/64)	❕
Lines	100.0% (0/0)	💚
Conditionals	100.0% (0/0)	💚

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

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Package network_traffic - 1.11.0 containing this change is available at https://epr.elastic.co/search?package=network_traffic

[elasticmachine]

Package network_traffic - 1.11.0 containing this change is available at https://epr.elastic.co/search?package=network_traffic