Update input template tests to use jsdom

Also refactor the tests to:

- move duplicated code (like rendering the same example of a component) into `beforeAll` blocks
- use `toHaveAccessibleDescription` and `toHaveAccessibleName` where appropriate
- not use snapshots

packages/govuk-frontend/src/govuk/components/input/input.yaml

@@ -180,8 +180,6 @@ examples:
     options:
       label:
         text: National Insurance number
-      hint:
-        text: It’s on your National Insurance card, benefit letter, payslip or P60. For example, ‘QQ 12 34 56 C’.
       id: input-with-error-message
       name: test-name-3
       errorMessage:
@@ -304,6 +302,12 @@ examples:
       name: autocapitalize
       type: text
       autocapitalize: none
+  - name: disabled
+    options:
+      label:
+        text: Disabled input
+      id: disabled-input
+      disabled: true
 
   - name: with prefix
     options: