Refactor localWhisper to use custom FFMPEGWrapper class (#4775)

* refactor localWhisper to use new custom FFMPEGWrapper class

* stub tests in github actions

* add back wavefile conversion to 16khz 32f to fix docker builds

* use afterEach for cleanup in ffmpeg tests

* remove unused FFMPEG_PATH env check

* use spawnSync for ffmpeg to capture and log output

* lint

* revert removal of try/catch around validateAudioFile for more helpful error msgs

* use readFileSync instead of createReadStream for less overhead

* change import to require for fix-path and stub import in tests

* refactor to singleton to preserve ffmpeg path
dev build

---------

Co-authored-by: Timothy Carambat <rambat1010@gmail.com>

.github/workflows/dev-build.yaml

@@ -6,7 +6,7 @@ concurrency:
 
 on:
   push:
-    branches: ['refactor-eslint-frontend'] # put your current branch to create a build. Core team only.
+    branches: ['4774-feat-refactor-collector-to-remove-fluent-ffmpeg-package'] # put your current branch to create a build. Core team only.
     paths-ignore:
       - '**.md'
       - 'cloud-deployments/*'