Allow the before and after hooks to be skipped

[spowser]

Describe the enhancement

Add a new property to the before_hook and after_hook to allow it to be skipped. Suggested name is if

Additional context

The current method I am using for getting a similar outcome is to add a ternary to the execute and run the commands or a set of "do nothing" commands. It would be nice to save the execution time and just completely avoid having to run anything if the condition is false

Default it to true to preserve current behavior

PoC (Proof of Concept)

terraform {
  after_hook X {
    commands  = ["init"]
    execute   = ["terraform", "workspace", "select", "-or-create", "${local.someValue}"]
    if        = local.isValidForUnitX
  }

  before_hook X {
    commands  = ["plan", "state", "apply", "destroy", "refresh"]
    execute   = ["terraform", "workspace", "select", "-or-create", "${local.someValue}"]
    if        = local.isValidForUnitX
  }

  after_hook Y {
    commands  = ["init"]
    execute   = ["terraform", "workspace", "select", "-or-create", "${local.someValue}"]
    if        = local.isValidForUnitY
  }

  before_hook Y {
    commands  = ["plan", "state", "apply", "destroy", "refresh"]
    execute   = ["terraform", "workspace", "select", "-or-create", "${local.someValue}"]
    if        = local.isValidForUnitY
  }
}

• PoC

Including a PoC can help others understand the feature better and implement it faster.

RFC Not Needed

• I have evaluated the complexity of this enhancement, and I believe it does not require an RFC.

[yhakbar]

The pattern that we typically use for this kind of thing is to use an if attribute.