Next Dev Launch Config Fix

[naasanov]

We had an issue where even after ending a frontend debug session, the process would stick around and block port 3000

Changes:

• Added a task that would kill all next dev processes
  • Attempts to kill just the proc on port 3000 did not work, via several methods. This was the only way I could find to kill the lingering process
• Added this task as a pre-launch task to the frontend launch
• Made frontend use "openExternally" instead of "debugWithChrome", which should prevent issues with the window not opening
• Also widened backend Allowed-Origins to allow any port on localhost to add flexibility for any similar issues in the future

Closes #125

[github-actions]

Test Results Summary

286 tests  ±0   286 ✅ ±0   9s ⏱️ -1s
  1 suites ±0     0 💤 ±0 
  1 files   ±0     0 ❌ ±0 

Results for commit 2fc32e9. ± Comparison against base commit e23a979.