fix(cmake): properly let falcoctl cmake module create /usr/share/falco/plugins/ folder.

[FedeDP]

What type of PR is this?

/kind bug

Any specific area of the project related to this PR?

/area build

What this PR does / why we need it:

#2997 dropped bundled plugins; but we still need to create /usr/share/falco/plugins folder to allow falcoctl to correctly work.

Which issue(s) this PR fixes:

Fixes #3103

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

fix(cmake): properly let falcoctl cmake module create /usr/share/falco/plugins/ folder.

[FedeDP]

/milestone 0.38.0

[FedeDP]

Tested locally:

-- Installing: /usr/local/share/falco/plugins

[FedeDP]

Note: we might want to drop this line from testing repo composite action: https://github.com/falcosecurity/testing/blob/main/action.yml#L65
Might help us spot regressions in the future (interesting fact: i added that line to fix failing tests in #2997... there is no limit to human stupidity 🤣 )

EDIT: in case we drop the line, tests against 0.37.0 and 0.37.1 would fail though.

[incertum]

/approve

@FedeDP don't blame yourself seriously! re https://github.com/falcosecurity/testing/blob/main/action.yml#L65 could we add a transition pipeline? Because yes I would remove that line to avoid future regressions.

[Andreagit97]

/approve

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Andreagit97, FedeDP, incertum

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