Remove unused actions (#36274)

* Modify CI action

Signed-off-by: Carlos Rodríguez Hernández <[email protected]>

* Remove update-crds and prometheus rules steps and change pull_request type

Signed-off-by: Fran Mulero <[email protected]>

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Signed-off-by: Carlos Rodríguez Hernández <[email protected]>
Signed-off-by: Fran Mulero <[email protected]>
Co-authored-by: Fran Mulero <[email protected]>

Author: carrodher