Restore GitLabDSL.api to be GitLabAPI instance

Revert "Ensures that the Gitlab API is exposed properly through the dts"

This reverts commit e8d2052.

The breakage is between 10.6.5 and 10.6.6 version

source/dsl/GitLabDSL.ts

@@ -1,5 +1,5 @@
 // Please don't have includes in here that aren't inside the DSL folder, or the d.ts/flow defs break
-import { Gitlab } from "@gitbeaker/node"
+import GitLabAPI from "../platforms/gitlab/GitLabAPI"
 import { RepoMetaData } from "./RepoMetaData"
 
 // getPlatformReviewDSLRepresentation
@@ -20,7 +20,7 @@ export interface GitLabDSL extends GitLabJSONDSL {
   utils: {
     fileContents(path: string, repoSlug?: string, ref?: string): Promise<string>
   }
-  api: InstanceType<typeof Gitlab>
+  api: GitLabAPI
 }
 
 // ---

source/platforms/GitLab.ts

@@ -228,5 +228,5 @@ export const gitlabJSONToGitLabDSL = (gl: GitLabDSL, api: GitLabAPI): GitLabDSL
   utils: {
     fileContents: api.getFileContents,
   },
-  api: api.apiInstance,
+  api,
 })

source/platforms/gitlab/GitLabAPI.ts

@@ -77,10 +77,6 @@ class GitLabAPI {
     return `${this.projectURL}/merge_requests/${this.prId}`
   }
 
-  get apiInstance() {
-    return this.api
-  }
-
   getUser = async (): Promise<GitLabUserProfile> => {
     this.d("getUser")
     const user = (await this.api.Users.current()) as GitLabUserProfile