chore: remove unrequired env var

[bryan-robitaille]

Summary | Résumé

Following the same pattern in the application for the other Lambda function calls by referencing a hardcoded value.

Simplifies the Infra as Code by not having to pass in an additional value that is already known.

Test instructions | Instructions pour tester la modification

• Submit a form
• Everything should submit a-ok

Unresolved questions / Out of scope | Questions non résolues ou hors sujet

In the tv show Loki how could you reach 'the end of time' when time itself is an infinite scaling problem.

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• Have you completely tested the functionality of change introduced in this PR? Is the PR solving the problem it's meant to solve within the scope of the related issue?
• The PR does not introduce any new issues such as failed tests, console warnings or new bugs.
• If this PR adds a package have you ensured its licensed correctly and does not add additional security issues?
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• Does your code have adequate comprehensible comments? Do new functions have docstrings?
• Have you modified the change log and updated any relevant documentation?
• Is there adequate test coverage? Both unit tests and end-to-end tests where applicable?
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🧪 Review environment

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