test: Set up e2e tests for HTTP Request node (#4718)

* 🧪 Add test identifiers

* ⚡ Add getters

* 🧪 Add initial test

* ⚡ Refactor to use actions

* ⚡ Refactor per Oleg's advice

* 🐛 Fix overlapping input label IDs

packages/editor-ui/src/views/CanvasAddButton.vue

@@ -1,7 +1,7 @@
 <template>
 	<div :class="$style.container" :style="containerCssVars" ref="container">
 		<n8n-tooltip placement="top" :value="showTooltip" manual :disabled="isScrimActive" :popper-class="$style.tooltip" :open-delay="700">
-			<button :class="$style.button" @click="$emit('click')">
+			<button :class="$style.button" @click="$emit('click')" data-test-id="canvas-plus-button">
 				<font-awesome-icon icon="plus" size="lg" />
 			</button>
 			<template #content>