[lldb][enums] Remove broadcast bits from debugger (#91618)

Removes the debugger broadcast bits from `Debugger.h` and instead uses
the enum from `lldb-enumerations.h` and adds the
`eBroadcastSymbolChange` bit to the enum in `lldb-enumerations.h`. This fixes a bug wherein the incorrect broadcast bit could be referenced due both of these enums previously existing and being out-of-sync with each other.