v9.2.1-canary.7

Patches

• Test CSS/Media Caching in Production Suite: #10184
• Stabilize New Dev Test: #10188
• Don't include core-js for default _document: #10187
• Test Query String with + Sign: #10186
• Disable core-js for server-side build: #10189
• Add hydration callback for testing: #10195
• Update tsconfig for tests: 592a2c2

Credits

Huge thanks to @Timer and @timneutkens for helping!