Fix release tarball base version naming

[tuhaihe]

For RC tags like X.Y.Z-incubating-rcN, generate the source tarball filename and top-level directory using VERSION_FILE (without -rcN).

$VERSION_FILE is input from the file version.

This keeps the voted bits ready for promotion without rebuilding and avoids -rcN showing up in the extracted source directory.

closes: #ISSUE_Number

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