fix(tsbuild): Avoid process.exit in library, add confirmskiplibcheck flag, improve CLI exit handling and JSON/quiet modes, update test script

ts/00_commitinfo_data.ts

@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@git.zone/tsbuild',
-  version: '2.6.7',
+  version: '2.6.8',
   description: 'A tool for compiling TypeScript files using the latest nightly features, offering flexible APIs and a CLI for streamlined development.'
 }