fix: update test fixtures for userId: string after ID->UID merge

Execution.spec.ts, processProgram.spec.ts and code.spec.ts didn't
exist when issue-361 (ID -> UID) branched, so they were written
against the old userId: number shape. Update them to match the
merged-in string-based uid now that main has been merged in.

api/src/controllers/internal/spec/Execution.spec.ts

@@ -8,7 +8,7 @@ import { RunTimeType } from '../../../utils'
 
 const preProgramVariables: PreProgramVars = {
   username: 'testUser',
-  userId: 1,
+  userId: '1',
   displayName: 'Test User',
   serverUrl: 'http://localhost:5000',
   httpHeaders: []

api/src/controllers/internal/spec/processProgram.spec.ts

@@ -11,7 +11,7 @@ import {
 
 const preProgramVariables: PreProgramVars = {
   username: 'testUser',
-  userId: 1,
+  userId: '1',
   displayName: 'Test User',
   serverUrl: 'http://localhost:5000',
   httpHeaders: []

api/src/routes/api/spec/code.spec.ts

@@ -71,13 +71,13 @@ describe('code', () => {
     permissionController = new PermissionController()
 
     const dbUser = await userController.createUser(user)
-    accessToken = await generateAndSaveToken(dbUser.id)
+    accessToken = await generateAndSaveToken(dbUser.uid)
 
     await permissionController.createPermission({
       path: '/SASjsApi/code/execute',
       type: PermissionType.route,
       principalType: PrincipalType.user,
-      principalId: dbUser.id,
+      principalId: dbUser.uid,
       setting: PermissionSettingForRoute.grant
     })
 
@@ -122,7 +122,7 @@ describe('code', () => {
   })
 })
 
-const generateAndSaveToken = async (userId: number) => {
+const generateAndSaveToken = async (userId: string) => {
   const accessToken = generateAccessToken({
     clientId,
     userId