[github] Add support for ingesting Advanced Security alerts for an entire organization

[kcreddy]

What does this PR do?

Currently Github Code Scanning, Secret Scanning, and Dependabot alerts only support repo level endpoints. This PR adds support for organisation endpoints giving choice to user to choose.

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.

[elasticmachine]

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• Start Time: 2022-08-02T09:08:48.686+0000

• Duration: 11 min 59 sec

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Check integration: github

• Took 0 min 1 sec . View more details here
• Description: ../../build/elastic-package check -v

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[kcreddy]

This enhancement will be covered in 2 PRs:
#3934 -> For Code Scanning, Secret Scanning
#3754 -> For Dependabot