remove deprecated fields group, scripts, and setVariables

[AustinAbro321]

Describe what should be investigated or refactored

Zarf should remove the deprecated fields .components.[x].group, .components.[x].scripts, and .components.[x].actions.[onWhenever].[when].setVariable.

These fields were deprecated in May 2023 with the v0.27.0. It is extremely unlikely that these are still in use. We currently have the verbiage that these fields will be removed in v1.0.0 in the warning. We should change the text in this warning, then remove the fields in a version thereafter.

group will be removed without replacement, though flavors can achieve a similar result
scripts -> actions
setVariable -> setVariables