[Github] Fix pagination and missing fields

[legoguy1000]

What does this PR do?

Resolve issue of paignation and missing created_at field. I also updated the event.* categorization fields to be more accurate.

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 Github audit logs pagination not working #3350

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Build stats

• Start Time: 2022-06-28T00:08:41.567+0000

• Duration: 14 min 59 sec

Test stats 🧪

Test	Results
Failed	0
Passed	19
Skipped	0
Total	19

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (1/1)	💚 3.44
Classes	100.0% (1/1)	💚 3.44
Methods	100.0% (12/12)	💚 10.877
Lines	96.753% (149/154)	👍 6.718
Conditionals	100.0% (0/0)	💚

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