[chore] add profiling options to nix and cabal files of brig and galley

[MangoIV]

Checklist

• [ ] Add a new entry in an appropriate subdirectory of changelog.d
• [ ] Read and follow the PR guidelines

[supersven]

To enable the external storage on EKS-based clusters, this needs to be set in the deployment's Helm values of brig and galley:

profLogs:
  enabled: true
  storageClassName: gp2