[Flight] Don't track Promise stack if there's no owner

[sebmarkbage]

This is a compromise because there can be a lot of Promise instances created. They're useful because they generally provide a better stack when batching/pooled connections are used.

This restores stack collection for I/O nodes so we have something to fallback on if there's no owner.

That way we can at least get a name or something out of I/O that was spawned outside a render but mostly avoids collecting starting I/O outside of render.

[react-sizebot]

Comparing: 777264b...d064e12

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	=	6.68 kB	6.68 kB	=	1.83 kB	1.83 kB
oss-stable/react-dom/cjs/react-dom-client.production.js	=	530.70 kB	530.70 kB	=	93.70 kB	93.70 kB
oss-experimental/react-dom/cjs/react-dom.production.js	=	6.69 kB	6.69 kB	=	1.83 kB	1.83 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js	=	655.25 kB	655.25 kB	=	115.40 kB	115.40 kB
facebook-www/ReactDOM-prod.classic.js	=	675.13 kB	675.13 kB	=	118.75 kB	118.75 kB
facebook-www/ReactDOM-prod.modern.js	=	665.56 kB	665.56 kB	=	117.12 kB	117.11 kB

Significant size changes

Includes any change greater than 0.2%:

(No significant changes)

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