chore(i18n): Readapt build scripts (RocketChat#36960)

Author: tassoevan

apps/meteor/.mocharc.base.json

@@ -3,7 +3,7 @@
 	"reporter": "spec",
 	"extension": ["js", "ts", "tsx"],
 	"require": [
-		"ts-node/register",
+		"tsx",
 		"./tests/setup/chaiPlugins.ts"
 	],
 	"watch-files": [

apps/meteor/.mocharc.definition.js

@@ -6,20 +6,6 @@
 
 const base = require('./.mocharc.base.json');
 
-/**
- * Mocha will run `ts-node` without doing type checking to speed-up the tests. It should be fine as `npm run typecheck`
- * covers test files too.
- */
-
-Object.assign(
-	process.env,
-	{
-		TS_NODE_FILES: true,
-		TS_NODE_TRANSPILE_ONLY: true,
-	},
-	process.env,
-);
-
 module.exports = {
 	...base, // see https://github.com/mochajs/mocha/issues/3916
 	require: [...base.require],

apps/meteor/.mocharc.js

@@ -6,20 +6,6 @@
 
 const base = require('./.mocharc.base.json');
 
-/**
- * Mocha will run `ts-node` without doing type checking to speed-up the tests. It should be fine as `npm run typecheck`
- * covers test files too.
- */
-
-Object.assign(
-	process.env,
-	{
-		TS_NODE_FILES: true,
-		TS_NODE_TRANSPILE_ONLY: true,
-	},
-	process.env,
-);
-
 module.exports = {
 	...base, // see https://github.com/mochajs/mocha/issues/3916
 	exit: true,