fix: revert always-recreate-tfdir branch

This MR revert "Merge branch 'always-recreate-tfdir' into 'main'" and also enable forced re-creation of tfdir using RUNWAY_FORCE_NEW_TFDIR envvar

For example, running RUNWAY_FORCE_NEW_TFDIR=true runwayctl reconciler plan staging locally should show

➜  ai-assist git:(sc1-test-config) ✗ RUNWAY_FORCE_NEW_TFDIR=true ./../../work/runway/runwayctl/bin/runwayctl reconciler plan staging
2024/05/27 21:42:18 Grafana client: the "GRAFANA_SA_TOKEN" environment variable is unset
WARNING: Running `terraform init` implicitly.
$ gitlab-terraform -- init -input=false

Initializing the backend...
...