Add field trial testing for ForceEnableServerSideSpeechRecognitionForDev experiment

Bug: b:331457898
Change-Id: Ie4fd8fe6d12097a7baf8d282d1963bc02c10f618
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5406055


Commit-Queue: Ahmed Nasr <anasr@google.com>
Reviewed-by: Benjamin Zielinski <bzielinski@google.com>
Cr-Commit-Position: refs/heads/main@{#1280198}