[github] Add support for ingesting Code Scanning, Secret Scanning alerts for an entire organization | Create dashboards

[kcreddy]

What does this PR do?

• For Github Code Scanning and Secret Scanning datastreams:
  • Add support for ingesting alerts for an entire organization instead of single repository
  • Create dashboards
• Also create Advanced Security Overview dashboard to provide an overview of Code Scanning, Secret Scanning, and Dependabot open alerts

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.

Screenshots

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Build stats

• Start Time: 2022-09-06T10:28:32.950+0000

• Duration: 19 min 54 sec

Test stats 🧪

Test	Results
Failed	0
Passed	28
Skipped	0
Total	28

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (4/4)	💚
Files	100.0% (4/4)	💚 2.89
Classes	100.0% (4/4)	💚 2.89
Methods	100.0% (50/50)	💚 10.389
Lines	94.299% (827/877)	👍 2.548
Conditionals	100.0% (0/0)	💚

[kcreddy]

/test

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