Add job link to reference flow question (#8431)

## Trello card URL

https://trello.com/c/SwlSZ9QT/2471-update-reference-flow-question

## Changes in this PR:

This PR adds a link to one of the questions in the reference flow to
allow the referee to refer to the job in question.

## Screenshots of UI changes:
<img width="1023" height="300" alt="Screenshot 2026-01-16 at 14 28 57"
src="https://github.com/user-attachments/assets/0f8d87f3-9d25-435e-a94e-fe6e422e254a"
/>

## Checklists:

### Data & Schema Changes

If this PR modifies data structures or validations, check the following:

- [ ] Adds/removes model validations
- [ ] Adds/removes database fields
- [ ] Modifies Vacancy enumerables (phases, working patterns, job roles,
key stages, etc.)

<details>
<summary>If any of the above options has changed then the author must
check/resolve all of the following...</summary>

### Integration Impact

Does this change affect any of these integrations?
- [ ] DfE Analytics platform
- [ ] Legacy imports mappings
- [ ] DWP Find a Job export mappings
- [ ] Publisher ATS API (may require mapping updates or API versioning)

### User Experience & Data Integrity

Could this change impact:
- [ ] Existing subscription alerts (will legacy subscription search
filters break?)
- [ ] Legacy vacancy copying (will copied vacancies fail new
validations?)
- [ ] In-progress drafts for Vacancies or Job Applications
</details>

Author: KyleMacPherson

app/views/referees/build_references/reference_information.html.slim

@@ -35,7 +35,7 @@ h1.govuk-heading-l = t(".heading", name: @referee.job_application.name)
       p.govuk-hint = t(".must_report")
     = f.govuk_radio_button :not_fit_to_practice, "false"
 
-  = f.govuk_radio_buttons_fieldset :able_to_undertake_role, legend: { tag: "h2" } do
+  = f.govuk_radio_buttons_fieldset :able_to_undertake_role, legend: { tag: "h2", text: t("helpers.legend.referees_reference_information_form.able_to_undertake_role_html", link: open_in_new_tab_link_to(t("helpers.legend.referees_reference_information_form.able_to_undertake_role_link_text"), job_path(@referee.job_application.vacancy))) } do
     = f.govuk_radio_button :able_to_undertake_role, "true"
     = f.govuk_radio_button :able_to_undertake_role, "false" do
       = f.govuk_text_area :unable_to_undertake_reason, label: nil, rows: 5, max_chars: Referees::ReferenceInformationForm::MAX_REFERENCE_FIELD_LENGTH

config/locales/publishers/build_reference_forms.yml

@@ -220,8 +220,11 @@ en:
           If the candidate is employed in a position where they are subject to a fit and proper persons check,
           have they been investigated for, or been found not fit to practice?
         able_to_undertake_role: >-
-          To the best of your knowledge and with reference to the attached job description and person specification,
+          To the best of your knowledge and with reference to the job description and person specification,
           are you satisfied that the candidate has the ability and is suitable to undertake this role?
+        able_to_undertake_role_html: "To the best of your knowledge and with %{link}, are you satisfied that the candidate has the ability and is suitable to undertake this role?"
+        able_to_undertake_role_link_text: reference to the attached job description and person specification
+
 
       referees_how_would_you_rate_form1:
         punctuality: Punctuality/timekeeping