Rename `DO_NOT_USE_OR_YOU_WILL_BE_FIRED_EXPERIMENTAL_IMG_SRC_TYPES` used for `<img>` to something meaningful.

[jerr3n]

React version: 19.2.3

1. Look in index.d.ts at ln 3613

DO_NOT_USE_OR_YOU_WILL_BE_FIRED_EXPERIMENTAL_IMG_SRC_TYPES could be renamed to something like ImgSrcTypes.

[thecodephilic-guy]

Makes sense