Small fixes to prepare_tcmalloc for Debian/Ubuntu compatibility

Tooltip fixes & optimizations

fix serving images that have already been saved without temp files function that broke after updating gradio

- /usr/sbin (where ldconfig is usually located) is not typically on users' PATHs by default, so we set that variable before trying to run ldconfig.
- The libtcmalloc library is called libtcmalloc_minimal on Debian/Ubuntu systems. We now check whether libtcmalloc_minimal exists when running prepare_tcmalloc.

* Instead of traversing tens of thousands of text nodes, only look at elements and their children
* Debounce the checks to happen only every one second

See:
https://github.com/AUTOMATIC1111/stable-diffusion-webui/pull/10649#issuecomment-1561047723

Merge branch 'custom-k-sched' of https://github.com/KohakuBlueleaf/stable-diffusion-webui into custom-k-sched

Co-authored-by: catboxanon <122327233+catboxanon@users.noreply.github.com>

Fix for #10643 (Inpainting mask sometimes not working)

Fix for #10643 (pixel noise in webui inpainting canvas breaking inpainting, so that it behaves like plain img2img)

Bump gradio to 3.32

disable `timeout_keep_alive`: fixes #10625 #10510 #10474