[TieredStorage] Allow AccountsFile::new_from_file to open a TieredStorage file #35071
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Problem
AccountsFile::new_from_file() currently always assumes it is
an AppendVec file without any format check.
Summary of Changes
This PR makes AccountsFile able to first detect the file type.
It first opens as a TieredStorage file, which first checks whether
the tailing magic-number matches. When the MagicNumber
mismatch, it will open as an AppendVec. Otherwise, it will
proceed by opening it as a tiered-storage file.
Dependency
#35049
#35063
#35065
#35066