[fleet] Require elastic packages with minimum spec version 3.0 by default #204542
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Summary
Introduce a minimum spec version by default, set to 3.0. This would be used starting on 9.0.
This is already the minimum spec version for packages in serverless, via the
xpack.fleet.internal.registry.spec.min
setting.Restricting by default the use of old spec versions will help us stop supporting them at some point in the future.
Checklist
Check the PR satisfies following conditions.
Reviewers should verify this PR satisfies this list as well.
release_note:breaking
label should be applied in these situations.release_note:*
label is applied per the guidelinesIdentify risks
xpack.fleet.internal.registry.spec.min
to allow older versions of the spec.