Add PagesDeployments to Project type

What does this MR do and why?

This MR adds PagesDeployments to the Project Graphql type

How to set up and validate locally

1. Set up your GDK to support Runners and Pages
2. Create a Pages project, e.g. by creating a project with the "Pages/Plain HTML" template
3. Run the pipeline to trigger a Pages deployment
4. Visit http://gdk.test:3000/-/graphql-explorer and run the below query:

query GetProjectPagesDeployments {
    project(fullPath: "<PROJECT_PATH>") {
      pagesDeployments {
        nodes {
          id
          active
        }
      }
    }
  }

Database Query information

Query

SELECT "pages_deployments".* 
  FROM "pages_deployments" 
  WHERE "pages_deployments"."project_id" = 42817607 
    AND "pages_deployments"."upload_ready" = TRUE
    AND "pages_deployments"."deleted_at" IS NULL 
    AND NOT ((
        "pages_deployments"."path_prefix" = '' 
        OR "pages_deployments"."path_prefix" IS NULL
    )) 
  ORDER BY "pages_deployments"."created_at" ASC

Query Plan

 Sort  (cost=3.45..3.46 rows=1 width=193) (actual time=0.050..0.051 rows=1 loops=1)
   Sort Key: pages_deployments.created_at
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=14
   I/O Timings: read=0.000 write=0.000
   ->  Index Scan using index_pages_deployments_on_project_id on public.pages_deployments  (cost=0.42..3.44 rows=1 width=193) (actual time=0.025..0.036 rows=1 loops=1)
         Index Cond: (pages_deployments.project_id = 42817607)
         Filter: (pages_deployments.upload_ready AND (pages_deployments.deleted_at IS NULL) AND (pages_deployments.path_prefix IS NOT NULL) AND (pages_deployments.path_prefix <> ''::text))
         Rows Removed by Filter: 4
         Buffers: shared hit=11
         I/O Timings: read=0.000 write=0.000