22939 [web] Cache CSS font string instead of the style object (cla: yes, platform-web, waiting for tree to go green)

22941 [web] Default styles for rich text (cla: yes, platform-web)

22942 [web] Introduce flag to enable new rich text implementation (cla: yes, platform-web)

22948 [web] Add complex rich text test cases and fix them (cla: yes, platform-web)

22951 [canvaskit] improve image error handling and messaging (cla: yes, platform-web)

22964 [web] Separate the height ruler from the other rulers (cla: yes, platform-web, waiting for tree to go green)

22966 [canvaskit] reuse canvases when window resizes (cla: yes, platform-web)