update(userspace/engine): align %container.info defaults with new rules style

[leogr]

What type of PR is this?

/kind cleanup

Any specific area of the project related to this PR?

/area engine

What this PR does / why we need it:

This PR aims to align the %container.info default substitution (ie. when -p is not used) with the latest rules style.

Special notes for your reviewer:

/milestone 0.36.0

Once this gets merged, documentation needs to be updated 👇
https://github.com/falcosecurity/falco-website/blob/master/content/en/docs/outputs/formatting.md?plain=1#L15

Does this PR introduce a user-facing change?:

update!: default substitution for `%container.info` is now equal `container_id=%container.id container_name=%container.name`

[github-actions]

This PR may bring feature or behavior changes in the Falco engine and may require the engine version to be bumped.

Please double check userspace/engine/falco_engine_version.h file. See versioning for FALCO_ENGINE_VERSION.

/hold

[LucaGuerra]

lgtm

[leogr]

This PR may bring feature or behavior changes in the Falco engine and may require the engine version to be bumped.

Please double check userspace/engine/falco_engine_version.h file. See versioning for FALCO_ENGINE_VERSION.

/hold

This feature does not bring any behavior changes in the Falco engine.
/hold cancel

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jasondellaluce, leogr, LucaGuerra

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• OWNERS [LucaGuerra,jasondellaluce,leogr]

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