Major UT Overhaul (#16544)

* Removes old UT definition files (drone/travis)
* Adds concurrency definitions to the workflows
* Changes our workflows to be more in line with what /tg does
* Adds a workflow to build/commit TGUI
* Adds a workflow to build/commit changelogs

Add python version to dependencies.sh
Fix dme errors
Removes a bunch of not included files
Cache Opendream and add directory to check_grep.py

Co-authored-by: Werner <Arrow768@users.noreply.github.com>

code/datums/helper_datums/construction_datum.dm

@@ -1,6 +1,3 @@
-#define FORWARD -1
-#define BACKWARD 1
-
 /datum/construction
 	var/list/steps
 	var/atom/holder
@@ -115,4 +112,4 @@
 	return FALSE
 
 /datum/construction/reversible/custom_action(index, diff, used_atom, user)
-	return TRUE
+	return TRUE