squash: use a single group

Author: arielvalentin

helpers/mysql/README.md

@@ -16,7 +16,7 @@ Add the gem to your instrumentation's Gemfile:
 ```ruby
 # Gemfile
 
-group :test, :development do
+group :test do
   gem 'opentelemetry-helpers-mysql', path: '../../helpers/mysql'
 end
 ```

helpers/sql-obfuscation/README.md

@@ -18,7 +18,7 @@ Add the gem to your instrumentation's Gemfile:
 ```ruby
 # Gemfile
 
-group :test, :development do
+group :test do
   gem 'opentelemetry-helpers-sql-obfuscation', path: '../../helpers/sql-obfuscation'
 end
 ```

instrumentation/mysql2/Gemfile

@@ -8,7 +8,7 @@ source 'https://rubygems.org'
 
 gemspec
 
-group :test, :development do
+group :test do
   gem 'opentelemetry-instrumentation-base', path: '../base'
   gem 'opentelemetry-helpers-sql', path: '../../helpers/sql'
   gem 'opentelemetry-helpers-mysql', path: '../../helpers/mysql'

instrumentation/rails/Gemfile

@@ -8,7 +8,7 @@ source 'https://rubygems.org'
 
 gemspec
 
-group :test, :development do
+group :test do
   gem 'pry-byebug'
   gem 'appraisal', '~> 2.5'
   gem 'bundler', '~> 2.4'