Add additional fixtures for FragmentInstance text node support

[jackpope]

Stacked on #35630

• Adds test case for compareDocumentPosition, missing before and also extending to text nodes
• Adds event handling fixture case for text
• Adds getRootNode fixture case for text

[react-sizebot]

Comparing: 3e319a9...deac5a0

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	+0.15%	608.67 kB	609.58 kB	+0.16%	107.63 kB	107.80 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	+0.14%	674.60 kB	675.51 kB	+0.15%	118.58 kB	118.75 kB
facebook-www/ReactDOM-prod.classic.js	+0.18%	693.92 kB	695.14 kB	+0.18%	121.98 kB	122.19 kB
facebook-www/ReactDOM-prod.modern.js	+0.18%	684.31 kB	685.52 kB	+0.18%	120.37 kB	120.59 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-reconciler/cjs/react-reconciler-reflection.production.js	+0.29%	11.29 kB	11.32 kB	+0.38%	2.63 kB	2.64 kB
oss-stable-semver/react-reconciler/cjs/react-reconciler-reflection.production.js	+0.29%	11.29 kB	11.32 kB	+0.38%	2.63 kB	2.64 kB
oss-stable/react-reconciler/cjs/react-reconciler-reflection.production.js	+0.29%	11.29 kB	11.32 kB	+0.38%	2.63 kB	2.64 kB
oss-experimental/react-reconciler/cjs/react-reconciler-reflection.development.js	+0.29%	12.75 kB	12.79 kB	+0.26%	2.71 kB	2.72 kB
oss-stable-semver/react-reconciler/cjs/react-reconciler-reflection.development.js	+0.29%	12.75 kB	12.79 kB	+0.26%	2.71 kB	2.72 kB
oss-stable/react-reconciler/cjs/react-reconciler-reflection.development.js	+0.29%	12.75 kB	12.79 kB	+0.26%	2.71 kB	2.72 kB
facebook-react-native/react-dom/cjs/ReactDOMClient-prod.js	+0.20%	595.71 kB	596.93 kB	+0.21%	104.80 kB	105.02 kB
facebook-react-native/react-dom/cjs/ReactDOMProfiling-prod.js	+0.20%	601.37 kB	602.59 kB	+0.21%	105.94 kB	106.16 kB

Generated by 🚫 dangerJS against deac5a0