Do not include feedback links in deprecated GHES versions (#16485)

* do not render if this is the oldest supported GHES release

* add tests

Author: sarahs

includes/contribution.html

@@ -1,4 +1,5 @@
-<div class="mt-3 f5">
+{% unless currentVersion contains enterpriseServerReleases.oldestSupported %}
+<div class="mt-3 f5 contribution">
   <h4>{% data ui.contribution_cta.title %}</h4>
   <p class="text-gray f6">{% data ui.contribution_cta.body %}</p>
   <a class="btn btn-outline" href={{ "https://github.com/github/docs/edit/main/content/" | append: page.relativePath }}>
@@ -7,3 +8,4 @@ <h4>{% data ui.contribution_cta.title %}</h4>
   </a>
   <p class="text-gray f6 mt-2">{% data ui.contribution_cta.or %} <a href="https://github.com/github/docs/blob/main/CONTRIBUTING.md" target="_blank">{% data ui.contribution_cta.to_guidelines %}</a></p>
 </div>
+{% endunless %}

includes/helpfulness.html

@@ -1,3 +1,4 @@
+{% unless currentVersion contains enterpriseServerReleases.oldestSupported %}
 <form class="js-helpfulness mt-4 f5" id="helpfulness-{{ helpId }}">
   <h4
     data-help-start
@@ -132,3 +133,4 @@
     {% data ui.helpfulness.feedback %}
   </p>
 </form>
+{% endunless %}

tests/routing/deprecated-enterprise-versions.js

@@ -96,6 +96,22 @@ describe('deprecation banner', () => {
   })
 })
 
+describe('does not render helpfulness prompt or contribution button', () => {
+  test('does not render helpfulness prompt', async () => {
+    let $ = await getDOM(`/en/enterprise/${enterpriseServerReleases.oldestSupported}/github`)
+    expect($('.js-helpfulness').length).toBe(0)
+    $ = await getDOM(`/en/enterprise/${enterpriseServerReleases.latest}/github`)
+    expect($('.js-helpfulness').length).toBeGreaterThan(0)
+  })
+
+  test('does not render contribution button', async () => {
+    let $ = await getDOM(`/en/enterprise/${enterpriseServerReleases.oldestSupported}/github`)
+    expect($('.contribution').length).toBe(0)
+    $ = await getDOM(`/en/enterprise/${enterpriseServerReleases.latest}/github`)
+    expect($('.contribution').length).toBeGreaterThan(0)
+  })
+})
+
 describe('JS and CSS assets', () => {
   it('returns the expected CSS file > 2.18', async () => {
     const result = await supertest(app)