Adds flags for insiders mode which enables experimental functionality prior to features becoming GA.

What's Changed

• Remove old projects and actions flags by @mattdholloway in https://github.com/github/github-mcp-server/pull/1894
• adding correct insiders name by @tonytrg in https://github.com/github/github-mcp-server/pull/1893

Full Changelog: https://github.com/github/github-mcp-server/compare/v0.30.0...v0.30.1