build(cmake)!: deprecate /etc/falco/rules.available

[leogr]

What type of PR is this?

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/kind bug

/kind cleanup

/kind design

/kind documentation

/kind failing-test

/kind feature

/kind release

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/area build

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What this PR does / why we need it:

Which issue(s) this PR fixes:

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Special notes for your reviewer:

/milestone 0.34.0

Does this PR introduce a user-facing change?:

build: `/etc/falco/rules.available` has been deprecated
build: `application_rules.yaml` is not shipped anymore with Falco
BREAKING CHANGE: if you relied upon `application_rules.yaml` you can download it from https://github.com/falcosecurity/rules/tree/main/rules and manually install it.

[FedeDP]

/approve

[FedeDP]

/approve

[Andreagit97]

/approve

[poiana]

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