Tekton Dashboard release v0.21.0

This Dashboard release supports Pipelines 0.20.x - 0.28.x and Triggers 0.10.x - 0.16.x, bringing a number of features, enhancements, and bug fixes.

Features

• ✨ Enable syntax highlighting for resource YAML views
• ✨ Add websocket support to the list pages generated for extensions
• ✨ Reduce Dashboard permissions
  Dashboard no longer requires access to Services, and ServiceAccounts are only required in read-write mode

Fixes

• 🐛 Fix error in PipelineRun, Task, and TaskTree stories

Misc

• 🔨 Switch Storybook to webpack 5
• 🔨 Remove duplicate styles
• 🔨 Update babel and its core plugins
• 🔨 Update route definitions to prepare for react-router major version bump
• 🔨 Remove unnecessary title on pod details tab
• 🔨 Update Chinese translations
• 🔨 Update tests to latest Pipelines release

Docs

• 📖 Add v0.20.0 links to readme
• 📖 Update logs walkthrough to specify minimum Kubernetes version
• 📖 Update supported Pipelines versions in readme

Thanks

Thanks to these contributors who contributed to v0.21.0!

• ❤️ @AlanGreene
• ❤️ @kid0809