Syntax fixes (#5367)

* Declare return types on functions

And a very few other type related minor fixes

* Minor syntax fixes

* Remove unnecessary escape chars in regexes
* Remove unnecessary awaits
* Replace deprecated req.connection with req.socket
* Replace deprecated upload with uploadOne
* Remove unnecessary eslint-disable-next-line comments
* Comment empty functions / catch or finally clauses
* Fix irregular whitespaces
* Add missing returns (null)
* Remove unreachable code
* A few logical fixes
* Remove / Handle non-null assertions which are certainly unnecessary (e.g. in
tests)

api/src/database/seeds/run.ts

@@ -25,7 +25,7 @@ type TableSeed = {
 	};
 };
 
-export default async function runSeed(database: Knex) {
+export default async function runSeed(database: Knex): Promise<void> {
 	const exists = await database.schema.hasTable('directus_collections');
 
 	if (exists) {