(PC-33825)[API] ci: deploy preview env only if api is changed

[lgerard-pass]

But de la pull request

Ticket Jira (ou description si BSR) : https://passculture.atlassian.net/browse/PC-33825

Tests :

• Run avec changement API : https://github.com/pass-culture/pass-culture-main/actions/runs/12675209117 (le déploiement fail mais c'est parce que mon autre PR n'est pas encore mergée)
• Run avec uniquement changement côté PRO : https://github.com/pass-culture/pass-culture-main/actions/runs/12674999031 (on target testing)

[github-actions]

Visit the preview URL for this PR (updated for commit c7a6b95):

https://pc-pro-testing--pr15787-pc-33825-deploy-pr-e-m5nutm8w.web.app

_{(expires Sat, 11 Jan 2025 09:12:14 GMT)}

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