Fix targeted versions for error banner downloads

[jotaemepereira]

Task/Issue URL: https://app.asana.com/0/1201048563534612/1209364376915316
Tech Design URL:
CC:

Description:
It adds macOS 15.0 to the version pool, showing the download error banner.

Steps to test this PR:

1. Hardcode the currentVersion to 15.0
2. In WebKitDownloadTask.tempDownloadFileCreated, add some code to throw a NSError with code NSFileReadUnknownError.
3. Then, try to download a file, it should be fail immediately and show the error banner
4. You can play with different hardcoded macOS versions to check if the banner is being shown.

Definition of Done:

• Does this PR satisfy our Definition of Done?

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Internal references:

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[alessandroboron]

LGTM! Thanks @jotaemepereira

I was suggesting to add tests but I can see that the class it doesn’t inject interfaces for its dependencies. Perhaps something we can improve in the future.