perf: use --release when watching

[anonrig]

It's useful to eliminate false positives when benchmarking and watching.

[untitaker]

if we want to do this then we should do it for make build-rs-dev as well, but i am somewhat cautious about the increased build time for regular snuba users

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b5311b4) 90.20% compared to head (34ca1b1) 90.20%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5452   +/-   ##
=======================================
  Coverage   90.20%   90.20%           
=======================================
  Files         889      889           
  Lines       43529    43529           
  Branches      288      288           
=======================================
  Hits        39265    39265           
  Misses       4222     4222           
  Partials       42       42           

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