Simplify release script to match react_on_rails without npm

Cleaned up release.rake to exactly match react_on_rails pattern but
without the npm/release-it parts that aren't needed for cypress-on-rails.

Removed from react_on_rails version:
- npm_version conversion logic
- release-it command execution
- Gemfile.lock updates for dummy apps
- gemspec cleanup for subdirectories
- GitHub packages publishing

Kept from react_on_rails version:
- Same structure and flow
- RaisingMessageHandler class
- TaskHelpers include pattern
- git pull --rebase
- gem bump with -v flag (fixed from --version)
- gem release to rubygems.org
- Post-release CHANGELOG reminder

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: justin808

rakelib/release.rake

@@ -15,15 +15,15 @@ desc("Releases the gem using the given version.
 
 IMPORTANT: the gem version must be in valid rubygem format (no dashes).
 
-This task depends on the gem-release ruby gem which is installed via `bundle install`
+This task depends on the gem-release (ruby gem) which is installed via `bundle install`
 
 1st argument: The new version in rubygem format (no dashes). Pass no argument to
               automatically perform a patch version bump.
 2nd argument: Perform a dry run by passing 'true' as a second argument.
 
 Note, accept defaults for rubygems options. Script will pause to get 2FA tokens.
 
-Example: `rake release[1.19.0,false]`")
+Example: `rake release[2.1.0,false]`")
 task :release, %i[gem_version dry_run] do |_t, args|
   include CypressOnRails::TaskHelpers