fix: resolve SimpleCov XML parsing error with MultiFormatter

- Configure SimpleCov to use both HTMLFormatter and CoberturaFormatter
- Prevents REXML::ParseException during coverage report generation
- Ensures robust coverage reporting for CI/CD pipelines

Author: AaronDDM

spec/spec_helper.rb

@@ -1,13 +1,18 @@
 # frozen_string_literal: true
 
 require "simplecov"
+require "simplecov-cobertura"
+
 SimpleCov.start do
   add_filter "/spec/"
+  
+  # Use multiple formatters to ensure coverage data is available
+  formatter SimpleCov::Formatter::MultiFormatter.new([
+    SimpleCov::Formatter::HTMLFormatter,
+    SimpleCov::Formatter::CoberturaFormatter
+  ])
 end
 
-require "simplecov-cobertura"
-SimpleCov.formatter = SimpleCov::Formatter::CoberturaFormatter
-
 require "nylas"
 require "support/nylas_helpers"