Fix ViewTransition null stateNode with SuspenseList

[jackpope]

I was experimenting with animations in SuspenseList and hit a crash using ViewTransition as a direct child with revealOrder="together"

    TypeError: Cannot read properties of null (reading 'autoName')

      33 |     return props.name;
      34 |   }
    > 35 |   if (instance.autoName !== null) {
         |                ^
      36 |     return instance.autoName;
      37 |   }

When ViewTransition is direct child of SuspenseList, the second render pass calls resetChildFibers, setting stateNode to null. Other fibers create stateNode in completeWork. ViewTransition does not, so stateNode is lost.

Followed the pattern used for Offscreen to update stateNode in beginWork if it is null.

Also added a regression test.

[react-sizebot]

Comparing: bb8a76c...fff8811

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable/react-dom/cjs/react-dom.production.js	=	6.84 kB	6.84 kB	=	1.88 kB	1.88 kB
oss-stable/react-dom/cjs/react-dom-client.production.js	=	608.03 kB	607.81 kB	=	107.61 kB	107.59 kB
oss-experimental/react-dom/cjs/react-dom.production.js	=	6.84 kB	6.84 kB	=	1.88 kB	1.88 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js	=	667.26 kB	667.03 kB	=	117.51 kB	117.47 kB
facebook-www/ReactDOM-prod.classic.js	=	693.38 kB	693.12 kB	=	122.00 kB	121.96 kB
facebook-www/ReactDOM-prod.modern.js	=	683.76 kB	683.55 kB	=	120.40 kB	120.35 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-experimental/react-debug-tools/cjs/react-debug-tools.development.js	=	33.37 kB	33.29 kB	=	5.93 kB	5.92 kB
oss-stable-semver/react-debug-tools/cjs/react-debug-tools.development.js	=	33.37 kB	33.29 kB	=	5.93 kB	5.92 kB
oss-stable/react-debug-tools/cjs/react-debug-tools.development.js	=	33.37 kB	33.29 kB	=	5.93 kB	5.92 kB
oss-experimental/react-debug-tools/cjs/react-debug-tools.production.js	=	29.78 kB	29.70 kB	=	5.81 kB	5.80 kB
oss-stable-semver/react-debug-tools/cjs/react-debug-tools.production.js	=	29.78 kB	29.70 kB	=	5.81 kB	5.80 kB
oss-stable/react-debug-tools/cjs/react-debug-tools.production.js	=	29.78 kB	29.70 kB	=	5.81 kB	5.80 kB

Generated by 🚫 dangerJS against fff8811

[sebmarkbage]

This seems to be an issue with many other ones too like Profiler, TracingMarker, Portals, etc. so might need a more systemic fix.