chore(test): Remove an invalid test.
chore(test): Remove an invalid test.

Rate limiting no longer occurs in fxa-client.js, and instead is
handled purely by resend-mixin.js. The "limits the number of
attempts" test was invalid, so it's gone.

mozilla/fxa-content-server,atiqueahmedziad/fxa-content-server,ofer43211/fxa-content-server,TDA/fxa-content-server,atiqueahmedziad/fxa-content-server,shane-tomlinson/fxa-content-server,atiqueahmedziad/fxa-content-server,TDA/fxa-two-factor-auth,swatilk/fxa-content-server,ofer43211/fxa-content-server,ReachingOut/fxa-content-server,swatilk/fxa-content-server,npestana/fxa-content-server,TDA/fxa-content-server,dannycoates/fxa-content-server,ofer43211/fxa-content-server,shane-tomlinson/fxa-content-server,vladikoff/fxa-content-server,riadhchtara/fxa-content-server,vladikoff/fxa-content-server,mozilla/fxa-content-server,ReachingOut/fxa-content-server,npestana/fxa-content-server,shane-tomlinson/fxa-content-server,riadhchtara/fxa-content-server,riadhchtara/fxa-password-manager,dannycoates/fxa-content-server,swatilk/fxa-content-server,dannycoates/fxa-content-server,riadhchtara/fxa-content-server,TDA/fxa-two-factor-auth,TDA/fxa-two-factor-auth,riadhchtara/fxa-password-manager,ReachingOut/fxa-content-server,riadhchtara/fxa-password-manager,mozilla/fxa-content-server,vladikoff/fxa-content-server,TDA/fxa-content-server,npestana/fxa-content-server