Add deletion related fields to projects GraphQL query

What does this MR do and why?

Add isSelfDeletionInProgress and isSelfDeletionScheduled fields. Used to determine the deletion state of projects.

References

• #556521 (closed)

How to set up and validate locally

Run the following in https://gdk.test:3000/-/graphql-explorer:

{
  projects(first: 2) {
    nodes {
      isSelfDeletionInProgress
      isSelfDeletionScheduled
    }
  }
}

You should get an output similar to:

{
  "data": {
    "projects": {
      "nodes": [
        {
          "isSelfDeletionInProgress": false,
          "isSelfDeletionScheduled": false
        },
        {
          "isSelfDeletionInProgress": false,
          "isSelfDeletionScheduled": false
        }
      ]
    }
  },
  "correlationId": "01K1WTX6KR90136KT7R7PJP5HD"
}

MR acceptance checklist

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Related to #556521 (closed)