feat: Enable cred setup for workflows created from templates (no-changelog) (#8240)

## Summary

Enable users to open credential setup for workflows that have been
created from templates if they skip it.

Next steps (will be their own PRs):
- Add telemetry events
- Add e2e test
- Hide the button when user sets up all the credentials
- Change the feature flag to a new one

## Related tickets and issues

https://linear.app/n8n/issue/ADO-1637/feature-support-template-credential-setup-for-http-request-nodes-that

packages/editor-ui/src/components/SetupWorkflowCredentialsButton/SetupWorkflowCredentialsButton.vue

@@ -0,0 +1,44 @@
+<script lang="ts" setup>
+import { useI18n } from '@/composables/useI18n';
+import { SETUP_CREDENTIALS_MODAL_KEY, TEMPLATE_CREDENTIAL_SETUP_EXPERIMENT } from '@/constants';
+import { useNodeTypesStore } from '@/stores/nodeTypes.store';
+import { usePostHog } from '@/stores/posthog.store';
+import { useUIStore } from '@/stores/ui.store';
+import { useWorkflowsStore } from '@/stores/workflows.store';
+import { doesNodeHaveCredentialsToFill } from '@/utils/nodes/nodeTransforms';
+import { computed, onBeforeUnmount } from 'vue';
+
+const workflowsStore = useWorkflowsStore();
+const nodeTypesStore = useNodeTypesStore();
+const uiStore = useUIStore();
+const posthogStore = usePostHog();
+const i18n = useI18n();
+
+const showButton = computed(() => {
+	const isFeatureEnabled = posthogStore.isFeatureEnabled(TEMPLATE_CREDENTIAL_SETUP_EXPERIMENT);
+	const isCreatedFromTemplate = !!workflowsStore.workflow?.meta?.templateId;
+	if (!isFeatureEnabled || !isCreatedFromTemplate) {
+		return false;
+	}
+
+	const nodes = workflowsStore.workflow?.nodes ?? [];
+	return nodes.some((node) => doesNodeHaveCredentialsToFill(nodeTypesStore, node));
+});
+
+const handleClick = () => {
+	uiStore.openModal(SETUP_CREDENTIALS_MODAL_KEY);
+};
+
+onBeforeUnmount(() => {
+	uiStore.closeModal(SETUP_CREDENTIALS_MODAL_KEY);
+});
+</script>
+
+<template>
+	<n8n-button
+		v-if="showButton"
+		:label="i18n.baseText('nodeView.setupTemplate')"
+		size="large"
+		@click="handleClick()"
+	/>
+</template>