[Journald] Convert to input package and make GA

[andrewkroh]

Convert the journald package to a Fleet input type ¹ package. The package-spec format_version will need bumped to at least 2.6.0. The Kibana version constraint should be moved to 8.8.0 which is when type: input packages are supported as GA in Fleet. Then make the package itself GA by bumping the version to 1.0.0.

Footnotes

1. https://github.com/elastic/package-spec/blob/29cc306237b541e7c32841548c09e25dcfd19333/spec/input/manifest.spec.yml#L28 ↩

[elasticmachine]

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