Removed unused collections repositories

no issue

- These repositories were leftover from first phases of collections development. Not needed any longer as we have more specialized bookshelf repositories in the core code

ghost/core/core/server/services/collections/PostsDataRepositoryBookshelf.js

@@ -1,23 +0,0 @@
-class PostsDataRepositoryBookshelf {
-    Post;
-
-    /**
-     * @param {Object} deps
-     * @param {import('../../models/post')} deps.Post
-     */
-    constructor(deps) {
-        this.Post = deps.Post;
-    }
-
-    /**
-     * @param {string[]} ids
-     * @returns {Promise<import('../../models/post')>}
-     **/
-    async getBulk(ids) {
-        return await this.Post.fetchAll({
-            filter: `id:[${ids.join(',')}]`
-        });
-    }
-}
-
-module.exports = PostsDataRepositoryBookshelf;

ghost/core/test/unit/server/services/collections/PostsDataRepositoryBookshelf.test.ts

@@ -1,23 +0,0 @@
-const sinon = require('sinon');
-const assert = require('assert/strict');
-const {PostsDataRepositoryBookshelf} = require('../../../../../core/server/services/collections/PostsDataRepositoryBookshelf');
-
-describe('PostsDataRepositoryBookshelf', function () {
-    let Post;
-
-    beforeEach(async function () {
-        Post = {
-            fetchAll: sinon.stub().resolves([])
-        };
-    });
-
-    it('Can fetch posts by ids', async function () {
-        const repository = new PostsDataRepositoryBookshelf({
-            Post: Post
-        });
-
-        await repository.getBulk(['1', '2']);
-
-        assert.ok(Post.fetchAll.calledOnce);
-    });
-});