fix(ruby): separate packageName from moduleName in ruby-v2 generator

[jsklan]

Description

Refs: #11567

Fixes a regression introduced in PR #11567 where packageName from publish config was incorrectly being used for folder/module naming in addition to the gemspec name. This broke existing SDKs like Square by:

• Changing folder structure (e.g., lib/square_rb/ instead of lib/square/)
• Normalizing the gemspec name (e.g., square_rb instead of square.rb)

Changes Made

• Removed packageName from the fallback chain in getRootFolderName() and getRootModuleName() - these now only use customConfig.moduleName or organization name
• Added new getGemName() method that returns packageName directly (without normalization) for the gemspec spec.name field
• Updated gemspec generation to use getGemName() instead of getRootFolderName() for the gem name
• Renamed custom config field from module to moduleName for clarity in BaseRubyCustomConfigSchema.ts
• Updated all references in AbstractRubyGeneratorContext.ts and DynamicSnippetsGeneratorContext.ts
• Added custom rubySnakeCase() function that preserves letter-digit sequences (e.g., "auth0" stays "auth0", not "auth_0")
• Added changelog entry for version 1.0.0-rc83

Updates since last revision

• Added fix for organization names with digits (e.g., "auth0") being incorrectly transformed to "auth_0"
• Replaced lodash's snakeCase with custom rubySnakeCase function that doesn't treat letter-to-number transitions as word boundaries
• Examples: "auth0" → "auth0", "OAuth2" → "oauth2", "MyCompany" → "my_company"

Testing

• Lint checks pass (pnpm run check)
• TypeScript compilation passes
• CI seed tests pass

Human Review Checklist

• Verify the separation of packageName (gemspec only) from folder/module naming is correct
• Confirm this restores the expected behavior for SDKs like Square
• Breaking change: The custom config field was renamed from module to moduleName - verify this is acceptable or if backward compatibility is needed
• Verify the custom rubySnakeCase function handles edge cases correctly (consecutive uppercase like "AWS" → "aws", mixed like "HTTPServer" → "http_server")
• Consider if any seed test fixtures should be updated to validate the auth0 edge case

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Link to Devin run
Requested by: @jsklan

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