Invalid resolve_placement code in generated plugin skeleton

[gboeer]

The 'plugins' plugin has an operation to generate a plugin skeleton.
When selecting the 'Has Placement' option, the generated code (at least the one which can be previewed) does not contain valid code.

E.g., the preview code shows

def resolve_placement(self, ctx):
        return types.Placement(
            types.Places.SAMPLES-GRID-SECONDARY-ACTIONS,
            label="My placement label",
            icon="/path/to/icon.svg",
            prompt=False
        )

While it should be

def resolve_placement(self, ctx):
        return types.Placement(
            types.Places.SAMPLES_GRID_SECONDARY_ACTIONS,
            types.Button(
                label="My placement label",
                icon="/path/to/icon.svg",
                prompt=False,
            ),
        )

Note, the invalid type types.Places.SAMPLES-GRID-SECONDARY-ACTIONS
and also the returned type is a single tuple instead of a tuple of tuples, which in my case does not produce any icon at all.
Only when I change my plugin code to the second variant (tuple of tuples) an icon will be shown.

The cause of the error should be in the function
https://github.com/voxel51/fiftyone-plugins/blob/5c800f1ded53c285f8e17f37e1ad9b2472fa93e7/plugins/plugins/__init__.py#L1630C1-L1656C18