test(e2e): Add test coverage for new behaviour

e2e/tests/api-driven/src/hasuraTriggers/hasuraTriggers.feature

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+Feature: Database triggers
+
+  @regression @add-user-trigger
+  Scenario: Adding a user to Planx
+    Given the Templates team exists
+    When a new user is added
+    Then they are granted access to the Templates team
+    And have the teamEditor role

e2e/tests/api-driven/src/hasuraTriggers/helpers.ts

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+import { $admin } from "../client";
+
+export const cleanup = async () => {
+  await $admin.user._destroyAll();
+  await $admin.team._destroyAll();
+};

e2e/tests/api-driven/src/hasuraTriggers/steps.ts

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+import { After, Given, Then, When, World } from "@cucumber/cucumber";
+import { cleanup } from "./helpers";
+import { User } from "@opensystemslab/planx-core/types";
+import { $admin } from "../client";
+import assert from "assert";
+import { createTeam, createUser } from "../globalHelpers";
+
+export class CustomWorld extends World {
+  user!: User;
+  templatesTeamId!: number;
+}
+
+After("@add-user-trigger", async function () {
+  await cleanup();
+});
+
+Given("the Templates team exists", async function (this) {
+  const templatesTeamId = await createTeam({ slug: "templates"});
+
+  assert.ok(templatesTeamId, "Templates team is not defined");
+
+  this.templatesTeamId = templatesTeamId;
+});
+
+When<CustomWorld>("a new user is added", async function (this) {
+  const userId = await createUser();
+  const user = await $admin.user.getById(userId);
+
+  assert.ok(user, "User is not defined");
+
+  this.user = user;
+});
+
+Then<CustomWorld>("they are granted access to the Templates team", async function (this) {
+  assert.strictEqual(this.user.teams.length, 1);
+  assert.strictEqual(this.user.teams[0].team.slug, "templates");
+  assert.strictEqual(this.user.teams[0].team.id, this.templatesTeamId);
+});
+
+Then<CustomWorld>("have the teamEditor role", async function (this) {
+  assert.strictEqual(this.user.teams[0].role, "teamEditor");
+});