When adding a custom scormreport plugin, the new plugin will not show up as an option in the actionbar of the scormactivities report tab, because the list of modules to choose from is hardcoded.

The actionbar should use the scorm_report_list method to obtain a list of available reports and display them accordingly to avoid users having to enter urls manually as well as to prevent users from trying to access reports that might have been removed

Reproduce:

Add any scormreport plugin to your moodle instance that is not included in moodle core.
Add a SCORM activity to any course and navigate to the SCORM activity
Navigate to the Reports tab
Confirm that your newly added plugin is not being listed in the report dropdown