DEV: Add pry-stack_explorer again (#26763)

This was reverted in 26a387c9c6
because the other pry gem changes there broke prod -- it
should be safe to just add this dev/test dependency

Gemfile

@@ -146,6 +146,7 @@ group :test, :development do
 
   gem "shoulda-matchers", require: false
   gem "rspec-html-matchers"
+  gem "pry-stack_explorer", require: false
   gem "byebug", require: ENV["RM_INFO"].nil?, platform: :mri
   gem "rubocop-discourse", require: false
   gem "parallel_tests"

Gemfile.lock

@@ -308,6 +308,9 @@ GEM
       pry (>= 0.13, < 0.15)
     pry-rails (0.3.9)
       pry (>= 0.10.4)
+    pry-stack_explorer (0.6.1)
+      binding_of_caller (~> 1.0)
+      pry (~> 0.13)
     public_suffix (5.0.5)
     puma (6.4.2)
       nio4r (~> 2.0)
@@ -623,6 +626,7 @@ DEPENDENCIES
   pg
   pry-byebug
   pry-rails
+  pry-stack_explorer
   puma
   rack
   rack-mini-profiler

spec/rails_helper.rb

@@ -19,6 +19,7 @@ require "rbtrace" if RUBY_ENGINE == "ruby"
 require "pry"
 require "pry-byebug"
 require "pry-rails"
+require "pry-stack_explorer"
 require "fabrication"
 require "mocha/api"
 require "certified"