Fixed #18409 - command line option to purge signatures

[snipe]

This introduces a command line tool to purge EULA PDFs and signature files that are older than X days to reduce the backup file size and handle general cleanup for very old EULAs.

snipeit:purge-eula-pdfs  
                            {--older-than-days= : The number of days we should delete before } 
                            {--force : Skip the interactive yes/no prompt for confirmation}
                            {--dryrun : Run the purge process but don\'t update the database or delete files}
                            {--with-output : Display the results in a table in your console}

It's arguable that we might want to add an option to only allow this for users who have been deleted, but I can see several different use-cases.

Fixes #18409

[marcusmoore]

Already merged but one minor formatting thing I noticed.

[marcusmoore]

The output of this line is weird because it's wrapped in ".

Suggested change

	if ($this->confirm("\n****************************************************\nTHIS WILL DELETE ALL OF THE SIGNATURES AND EULA PDF FILES SINCE '.$interval_date.'. \nThere is NO undo! \n****************************************************\n\nDo you wish to continue? No backsies! [y|N]")) {
	if ($this->confirm("\n****************************************************\nTHIS WILL DELETE ALL OF THE SIGNATURES AND EULA PDF FILES SINCE $interval_date \nThere is NO undo! \n****************************************************\n\nDo you wish to continue? No backsies! [y|N]")) {

[snipe]

Handled, ty!