fix: export ConvertTo-JsonManifest as a public function - #455

  3 files  ± 0  213 suites  +12   42s ⏱️ +17s
243 tests +20  241 ✅ +20  2 💤 ±0  0 ❌ ±0 
729 runs  +60  723 ✅ +60  6 💤 ±0  0 ❌ ±0 

Results for commit a20defe. ± Comparison against earlier commit a54ac11.