mdlry_files table is a table of all files that have been uploaded to moodle as content in courses.
All rows that you show in the screen shot reference the same .zip file that appears to be the errant tinymce iassign add on.
There should be a column for 'contenthash' for those rows. That's the real location of that file in the sea of files in moodledata/filedir/
A 'contenthash' is a bunch of lower case letters and numbers.
Looks like: 76c74ae098e1b7e841d49011fcb8a58b258250a4
Find the contenthash for that zip file.
Then use a file browsing tool to find your contenthash in moodledata/filedir/ ... if found ... delete it ... also remove the rows in the your mdlry_files table.
Also, in moodledata/cache ... there are a bunch of folders and files. Delete them all. That's *moodledata* directory - *NOT* the cache directory in moodle code.
Hopefully, that will resolve the issue.
Those rows should not be there so the attempt to install the plugin didn't follow directions for how to install a plugin.