[Meta] [Security External Integrations] Update package format version to 2.0.0

[narph]

New package format version is available (2.0.0) and introduces additional validations.

Initial code change requires updating format_version to 2.0.0 in the security package manifests.

This could trigger validation issues and contains breaking changes, more on troubleshooting here https://github.com/elastic/elastic-package/blob/main/docs/howto/update_major_package_spec.md

Potentially automate the update process if the number of changes turns out to be too big.

@jsoriano any restrictions here?

[elasticmachine]

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

[efd6]

@andrewkroh's ecs-update could easily be bent to do this since it already {de,re}-serialises the packages' manifests.

[botelastic]

Hi! We just realized that we haven't looked into this issue in a while. We're sorry! We're labeling this issue as Stale to make it hit our filters and make sure we get back to it as soon as possible. In the meantime, it'd be extremely helpful if you could take a look at it as well and confirm its relevance. A simple comment with a nice emoji will be enough :+1. Thank you for your contribution!

[andrewkroh]

Closing. Package are on to 3.0.0 now. #7810