Draft: Bug 40060: Define versionName in Fenix build

Matthew Finkelrequested to merge
sysrqb/tor-browser-build:bug_40060_00 into master

Closes #40060 (closed)

We can simplify this into one definition when we use torbrowser_version defined in rbm.conf instead of version locally defined for fenix.

See #40060 (comment 2709985) for more details.

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