Refactor usages of blacklist and whitelist

[VincentDondain]

Fixes #5275

Refactor usages of 'whitelist' and 'blacklist' to 'allowlist' and 'denylist'.

• Rename ExternalApiWhitelist.java to ExternalApiAllowlist.java and update class name and references.
• Update ServerConnectListManager.java to use 'allowlist' and 'denylist' instead of 'whitelist' and 'blacklist'.
• Update SelectGameScreen.java to use 'allowlist' and 'denylist' instead of 'whitelist' and 'blacklist'.
• Update SubtypeLayoutBuilder.java to use 'allowlist' instead of 'whitelist'.
• Add ModuleEnvironmentTest.java to test the new ExternalApiAllowlist class.

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[BenjaminAmos]

I appreciate you trying but this is generally just poor-quality.

You have removed all the copyright notices from every file you touched. That is not acceptable and in violation of the project's licence. Please reinstate them.

Please also take into account the backwards-compatibility concerns I mentioned in #5277 (review).

You have also introduced a unit test under engine/src/main/java/, which is not a test source root. That was never going to compile.

I would advise not using copilot-like tools to do everything for you at this stage. They are not quite there yet. Please scrutinise the output closely as a human being who hopefully has an understanding of what was produced before sending it to other people in-future.

[VincentDondain]

Fair enough closing as duplicate of #5277