bitbake: toaster: add rev dep column to image detail pages

Add a column to the custom image pages that shows the reverse
dependencies in a format matching the dependencies column:
  - either blank or a button showing the count of reverse dependencies,
  - when the button is clicked, a popover appears showing the list
    of reverse dependencies, with each package's size, and the total
    size of all of the reverse dependencies.

The implementation adds a packages table method to retreive the reverse
dependency total size, and adds a separate 'popover' html template. Both
of these changes follow the pattern for the dependencies column.

[YOCTO #9163]

(Bitbake rev: 2f978dccaa1ec82c7ad350bdc1cd9500000984eb)

Signed-off-by: Dave Lerner <dave.lerner@windriver.com>
Signed-off-by: Elliot Smith <elliot.smith@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/toaster/toastergui/tables.py

@@ -725,6 +725,12 @@ class PackagesTable(ToasterTable):
                         static_data_template='\
                         {% include "snippets/pkg_dependencies_popover.html" %}')
 
+        self.add_column(title="Reverse dependencies",
+                        static_data_name="reverse_dependencies",
+                        static_data_template='\
+                        {% include "snippets/pkg_revdependencies_popover.html" %}',
+                        hidden=True)
+
         self.add_column(title="Recipe",
                         field_name="recipe__name",
                         orderable=True,