LibPartition: Migrate from DeprecatedFile to File

The implemented cloning mechanism should be sound:
- If a PartitionTable is passed a File with
  ShouldCloseFileDescriptor::Yes, then it will keep it alive until the
  PartitionTable is destroyed.
- If a PartitionTable is passed a File with
  ShouldCloseFileDescriptor::No, then the caller has to ensure that the
  file descriptor remains alive.
If the caller is EBRPartitionTable, the same consideration holds.
If the caller is PartitionEditor::PartitionModel, this is satisfied by
keeping an OwnPtr<Core::File> around which is the originally opened
file.

Therefore, we never leak any fds, and never access a Core::File or fd
after destroying it.

Userland/Libraries/LibPartition/EBRPartitionTable.h

@@ -15,13 +15,8 @@ class EBRPartitionTable : public MBRPartitionTable {
 public:
     ~EBRPartitionTable();
 
-#ifdef KERNEL
-    static ErrorOr<NonnullOwnPtr<EBRPartitionTable>> try_to_initialize(Kernel::StorageDevice&);
-    explicit EBRPartitionTable(Kernel::StorageDevice&);
-#else
-    static ErrorOr<NonnullOwnPtr<EBRPartitionTable>> try_to_initialize(NonnullRefPtr<Core::DeprecatedFile>);
-    explicit EBRPartitionTable(NonnullRefPtr<Core::DeprecatedFile>);
-#endif
+    static ErrorOr<NonnullOwnPtr<EBRPartitionTable>> try_to_initialize(PartitionableDevice);
+    explicit EBRPartitionTable(PartitionableDevice);
 
     virtual bool is_valid() const override
     {
@@ -29,11 +24,7 @@ public:
     }
 
 private:
-#ifdef KERNEL
-    void search_extended_partition(Kernel::StorageDevice&, MBRPartitionTable&, u64, size_t limit);
-#else
-    void search_extended_partition(NonnullRefPtr<Core::DeprecatedFile>, MBRPartitionTable&, u64, size_t limit);
-#endif
+    void search_extended_partition(MBRPartitionTable&, u64, size_t limit);
 
     bool m_valid { false };
 };