[web] Remove absolute font-size for `code`, `kdb`, `samp` (#24078)
* Swap pre/div in split-test-dump-modal.tsx
* Remove fixed font-size and line-height for code/kdb/pre/samp
* Set the font-size of code,kdb,samp to 1em instead of 0.875em
* Remove unnecessary `font-size: inherit`
GitOrigin-RevId: b5b19cf08774312ad1b3c4dcf16ea08e08093ccb