DROID-2631 Editor | Feature | Add a "Select All" button;

[Nadezhda-Gurova]

Clicking it selects all blocks, and if all blocks are already selected, nothing happens on subsequent clicks

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Description

What type of PR is this? (check all applicable)

• [ ] 🍕 Feature
• [ ] 🐛 Bug Fix
• [ ] 📝 Documentation Update
• [ ] 🎨 Style
• [ ] 🧑‍💻 Code Refactor
• [ ] 🔥 Performance Improvements
• [ ] ✅ Test
• [ ] 🤖 Build
• [ ] 🔁 CI

Related Tickets & Documents

Mobile & Desktop Screenshots/Recordings

Added tests?

• [ ] 👍 yes
• [ ] 🙅 no, because they aren't needed
• [ ] 🙋 no, because I need help

Added to documentation?

• [ ] 📜 README.md
• [ ] 📓 tech-docs
• [ ] 🙅 no documentation needed

[optional] Are there any post-deployment tasks we need to perform?