refactor(ci): Consolidate quickstart jobs in prerelease.yml

[ncooke3]

manual: https://github.com/firebase/firebase-ios-sdk/actions/runs/17247971263

#no-changelog

[gemini-code-assist]

Using Gemini Code Assist

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Invoking Gemini

You can request assistance from Gemini at any point in your pull request via creating an issue comment (i.e. comment on the pull request page) using either /gemini <command> or @gemini-code-assist <command>. Below is a summary of the supported commands.

Feature	Command	Description
Code Review	/gemini review	Performs a code review for the current pull request in its current state.
Pull Request Summary	/gemini summary	Provides a summary of the current pull request in its current state.
Comment	@gemini-code-assist	Responds in comments when explicitly tagged, both in issue comments and review comments.
Help	/gemini help	Displays a list of available commands.

Customization

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[paulb777]

Nice code reduction!