Safari version warning label hidden if it's version is higher or equal to 15

[tomasstrba]

Task/Issue URL: https://app.asana.com/0/1177771139624306/1202116285049224/f

Description:
The import flow doesn't contain the Safari version warning if the current version requirement is met.

Steps to test this PR:

1. On macOS Monterey: Go to "Import bookmarks and Passwords..", choose "Safari". Make sure there is no warning "Requires Safari 15 or later"
2. On older macOS with Safari version 14 or older: Go to "Import bookmarks and Passwords..", choose "Safari". Make sure the warning "Requires Safari 15 or later" is present

Testing checklist:

• Test with Release configuration
• Test proper deallocation of tabs
• Make sure committed submodule changes are desired

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Internal references:

Software Engineering Expectations
Technical Design Template
When ready for review, remember to post the PR in MM

[samsymons]

LGTM, though I think we can improve the SafariVersionReader in a few ways:

1. We could update it to look up Safari's path at runtime using NSWorkspace.shared.absolutePathForApplication(withBundleIdentifier: safariBundleID), since I don't trust that Safari will always be installed at that location
2. It could take a dependency injected path, defaulting to the path provided by NSWorkspace
3. Then, we could bundle in different copies of the Safari Info.plist and pass their paths in during unit tests, to really verify that the version checks are accurate.

All of these are nice to haves that aren't directly related to the code edited in this PR, so feel free to disregard them. 🙂

[tomasstrba]

Thanks @samsymons! Agree with all improvements of SafariVersionReader 👍