MM-58525 Fix upload file permissions (#27298)

* tie create_post and upload_file permissions together

* update tests

* update file name

* update migration to do in batches

* Update 000122_remove_upload_file_permission.up.sql

* fix formatting

* simplify migrations, fix regex issue

* update file names for recent merge

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

server/channels/db/migrations/mysql/000123_remove_upload_file_permission.down.sql

@@ -0,0 +1 @@
+-- Skipping it because the forward migrations are destructive

server/channels/db/migrations/mysql/000123_remove_upload_file_permission.up.sql

@@ -0,0 +1,18 @@
+CREATE PROCEDURE RemoveUuploadFilePermission()
+BEGIN
+    updateRoles: LOOP
+        -- update affected rows
+        UPDATE Roles 
+            SET Permissions = REGEXP_REPLACE(Permissions, 'upload_file([[:space:]]|$)', '')
+            WHERE Permissions like '%upload_file%' and Permissions not REGEXP 'create_post([[:space:]]|$)'
+            LIMIT 100;
+
+          -- check if the loop has completed    
+          IF  ROW_COUNT() < 100 THEN
+              LEAVE updateRoles;
+          END IF;    
+    END LOOP updateRoles;
+END;
+
+CALL RemoveUuploadFilePermission();
+DROP PROCEDURE IF EXISTS RemoveUuploadFilePermission;