Check plan has changes before apply

[eliihen]

Merging this PR will do two things:

1. Apply will no longer run if the previous plan step identified no changes
2. Adds a deploy_on input to override the branch that is used for deplying. It also makes testing of deploy easier on other branches

terraform_wrapper is now required as we read the exitcode output set by the wrapper script. On-prem runners do not have node which the script requires so we install that too.

[eliihen]

Verifisert oppførsel på IAM branch.

Uten endringer

https://github.com/kartverket/iam/runs/7338888007

Med endringer

Startet men cancelled så vi ikke deploya tullet jeg testa med til clusteret
https://github.com/kartverket/iam/runs/7338753400