NPA-6550: Fix prod deployment

[ehallam]

Pull Request

🧾 Ticket Link

https://nhsd-jira.digital.nhs.uk/browse/NPA-6550

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📄 Description/Summary of Changes

• Change the GitHub environment to "production" from "prod"
• This was an already existing bug, the environment type just never got used before

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🧪 Developer Testing Carried Out

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Please ensure the following naming conventions are followed:

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[Copilot]

Pull request overview

Adjusts the production deployment workflow configuration to align environment naming with the intended GitHub “production” environment, aiming to fix production deployment gating/behavior.

Changes:

• Updated the workflow’s ENVIRONMENT value from "prod" to "production" for the setup-proxygen-prod action input.
• Updated the deploy step environment variable ENVIRONMENT from "prod" to "production".

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated no new comments.

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