Fix FXIOS-14250 - TestFlight Nightly Submission via API

[hneiva]

📜 Tickets

Jira ticket
Github issue

💡 Description

Added remaining api calls to automate releasing the app to testflight automatically.

🎥 Demos

Before	After

Demo

📝 Checklist

• I filled in the ticket numbers and a description of my work
• I updated the PR name to follow our PR naming guidelines
• I ensured unit tests pass and wrote tests for new code
• If working on UI, I checked and implemented accessibility (Dynamic Text and VoiceOver)
• If adding telemetry, I read the data stewardship requirements and will request a data review
• If adding or modifying strings, I read the guidelines and will request a string review from l10n
• If needed, I updated documentation and added comments to complex code

[mobiletest-ci-bot]

🧹 Tidy commit

Just 1 file(s) touched. Thanks for keeping it clean and review-friendly!

✅ Per-file coverage

All changed files meet the threshold of 35.0%.

Generated by 🚫 Danger Swift against 02eccc0

[mattreaganmozilla]

Approving but it looks like string linter is failing

[mattreaganmozilla]

Merging since linter issue is not related to this PR

[github-actions]

🚀 PR merged to main, targeting version: 147.0