Revert "Bump release to 2.0.0-beta"

Should'nt kirkstone branches be used after beta release? because new changes wont be tested by CI

This reverts commit db7e0150.

Forwarded: https://gitlab.eclipse.org/eclipse/oniro-core/oniro/-/merge_requests?author_username=pcoval&scope=all&state=all Signed-off-by: Philippe Coval philippe.coval.ext@huawei.com