coat: Make CommandLineOverrideHelper flavor-agnostic

[kjyoun]

Refactor CommandLineOverrideHelper to be build-flavor agnostic by
removing the CommandLineOverrideHelperParams class and accepting a
list of strings directly. This simplifies the interface and moves
environment-specific logic, such as the official build check for
remote-allow-origins, into CobaltActivity.

The change also consolidates command-line switch applications into a
single batch call and flattens nested loops for better readability.
CobaltActivity now linearly accumulates arguments from intents and
metadata. Updated unit tests to reflect the API changes.

Bug: 414009070

[github-actions]

🤖 Gemini Suggested Commit Message

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android: Make CommandLineOverrideHelper flavor-agnostic

Refactor CommandLineOverrideHelper to be build-flavor agnostic by
removing the CommandLineOverrideHelperParams class and accepting a
list of strings directly. This simplifies the interface and moves
environment-specific logic, such as the official build check for
remote-allow-origins, into CobaltActivity.

The change also consolidates command-line switch applications into a
single batch call and flattens nested loops for better readability.
CobaltActivity now linearly accumulates arguments from intents and
metadata. Updated unit tests to reflect the API changes.

Bug: 414009070

---

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[github-actions]

Context	State	Description
CI / android	✅ PASS	Passed
CI / aosp	✅ PASS	Passed
CI / evergreen	✅ PASS	Passed
CI / linux	✅ PASS	Passed
CI / tvos	✅ PASS	Passed
import/copybara	✅ PASS	Change imported to Gerrit
kokoro	✅ PASS	Kokoro build finished

[gemini-code-assist]

Code Review

This pull request refactors command-line argument handling in CobaltActivity and CommandLineOverrideHelper by transitioning from arrays and custom parameter objects to a simpler List structure. It cleans up the initialization flow and updates the corresponding unit tests. The feedback suggests handling potential empty strings when splitting arguments by semicolons in CommandLineOverrideHelper to avoid generating malformed command-line switches.