feat: add terraform plan job to ci

[sweatybridge]

What kind of change does this PR introduce?

feature

What is the new behavior?

Adds example terraform module to

• sync project settings
• create preview branch

Additional context

Add any other context or screenshots.

[github-actions[bot]]

Terraform Format and Style 🖌success

Terraform Initialization ⚙️success

Terraform Validation 🤖success

Validation Output

``` Success! The configuration is valid. ```

Terraform Plan 📖failure

Show Plan

``` terraform data.supabase_branch.all: Reading... Terraform used the selected providers to generate the following execution plan. Resource actions are indicated with the following symbols: + create Terraform planned the following actions, but then encountered a problem: # supabase_settings.production will be created + resource "supabase_settings" "production" { + api = jsonencode( { + db_extra_search_path = "public,extensions" + db_schema = "public,storage,graphql_public" + max_rows = 1000 } ) + id = (known after apply) + project_ref = "cimpzzikygouamvsjwxa" } Plan: 1 to add, 0 to change, 0 to destroy. ```

Pusher: @sweatybridge, Action: pull_request, Working Directory: supabase/remotes, Workflow: CI