Add link to personal statement tool

[KyleMacPherson]

Trello card URL

https://trello.com/c/mM286qCi/2433-build-initial-testing-integration-with-external-personal-statement-tool

Changes in this PR:

This PR adds a link to the personal statement builder

Screenshots of UI changes:

job page:

job application page:

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.)

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

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

[github-actions]

Review app deployed to https://teaching-vacancies-review-pr-8399.test.teacherservices.cloud on AKS