Run gdb stubtests (#11644)

The gdb package is only available inside gdb and cannot be installed externally through e.g. pip.
Run the stubtest inside gdb.

stubs/gdb/@tests/stubtest_allowlist.txt

@@ -0,0 +1,119 @@
+# TODO: Update types in stub
+# This list includes everything to allow initial stubtests to run in gdb's environment
+gdb.BP_NONE
+gdb.Breakpoint.stop
+gdb.BreakpointEvent
+gdb.ClearObjFilesEvent
+gdb.Command.complete
+gdb.Command.invoke
+gdb.ConnectionEvent
+gdb.ContinueEvent
+gdb.DUMMY_FRAME
+gdb.Event
+gdb.EventRegistry
+gdb.ExitedEvent
+gdb.FRAME_UNWIND_FIRST_ERROR
+gdb.FinishBreakpoint.out_of_scope
+gdb.Function.invoke
+gdb.GdbExitingEvent
+gdb.GdbSetPythonDirectory
+gdb.HOST_CONFIG
+gdb.Inferior.connection
+gdb.Inferior.thread_from_thread_handle
+gdb.InferiorCallPostEvent
+gdb.InferiorCallPreEvent
+gdb.InferiorDeletedEvent
+gdb.InferiorThread.details
+gdb.Instruction
+gdb.LazyString
+gdb.LineTable.__next__
+gdb.LineTable.is_valid
+gdb.LineTable.source_lines
+gdb.LineTable.source_lnes
+gdb.LineTableIterator
+gdb.MICommand.invoke
+gdb.Membuf
+gdb.MemoryChangedEvent
+gdb.NewInferiorEvent
+gdb.NewObjFileEvent
+gdb.NewThreadEvent
+gdb.Objfile.frame_unwinders
+gdb.Objfile.lookup_static_method
+gdb.Objfile.lookup_static_symbol
+gdb.Objfile.xmethods
+gdb.Parameter.get_set_string
+gdb.Parameter.get_show_string
+gdb.Progspace.frame_unwinders
+gdb.Progspace.xmethods
+gdb.Record
+gdb.RecordFunctionSegment
+gdb.RecordGap
+gdb.RecordInstruction
+gdb.RegisterChangedEvent
+gdb.RegisterDescriptor
+gdb.RegisterDescriptorIterator
+gdb.RegisterGroup
+gdb.RegisterGroupsIterator
+gdb.RemoteTargetConnection
+gdb.SYMBOL_FUNCTIONS_DOMAIN
+gdb.SYMBOL_TYPES_DOMAIN
+gdb.SYMBOL_VARIABLES_DOMAIN
+gdb.SignalEvent
+gdb.StopEvent
+gdb.TARGET_CONFIG
+gdb.ThreadEvent
+gdb.TuiWindow
+gdb.Type.__contains__
+gdb.Type.get
+gdb.Type.has_key
+gdb.Type.is_scalar
+gdb.Type.is_signed
+gdb.Type.items
+gdb.Type.iteritems
+gdb.Type.iterkeys
+gdb.Type.itervalues
+gdb.Type.keys
+gdb.Type.values
+gdb.TypeIterator
+gdb.Unwinder
+gdb.Value.rvalue_reference_value
+gdb.frame_filters
+gdb.frame_unwinders
+gdb.packages
+gdb.prompt_hook
+gdb.type_printers
+gdb.xmethods
+gdb.events
+gdb.printing.RegexpCollectionPrettyPrinter.RegexpSubprinter
+gdb.printing.add_builtin_pretty_printer
+gdb.prompt.prompt_help
+gdb.prompt.prompt_substitutions
+gdb.types.TypePrinter.instantiate
+gdb.unwinder.Unwinder
+gdb.xmethod.SimpleXMethodMatcher
+gdb.xmethod.XMethodMatcher.match
+gdb.xmethod.XMethodWorker.__call__
+gdb.xmethod.XMethodWorker.get_arg_types
+gdb.xmethod.XMethodWorker.get_result_type
+gdb.FrameDecorator
+gdb.FrameIterator
+gdb.command
+gdb.command.explore
+gdb.command.frame_filters
+gdb.command.pretty_printers
+gdb.command.prompt
+gdb.command.type_printers
+gdb.command.unwinders
+gdb.command.xmethods
+gdb.frames
+gdb.function
+gdb.function.as_string
+gdb.function.caller_is
+gdb.function.strfns
+gdb.printer
+gdb.printer.bound_registers
+gdb.printing.basestring
+gdb.printing.long
+gdb.xmethod.basestring
+gdb.xmethod.long
+gdb.styling

stubs/gdb/METADATA.toml

@@ -11,6 +11,5 @@ extra_description = """\
 """
 
 [tool.stubtest]
-# Since the "gdb" Python package is available only inside GDB, it is not
-# possible to install it through pip, so stub tests cannot install it.
-skip = true
+platforms = ["linux"]
+apt_dependencies = ["gdb"]