Fix for old school error issues, improvements to new school

[sophiajt]

This PR:

• Fixes some old school error issues, specifically The old errors always show the same line for borrowck messages #33559, "Old school" error mode is now missing information first/second borrow #33543, New errors: expected/found types omitted #33366
• Improves wording borrowck errors with match patterns
• De-emphasize multi-line spans, so we don't color the single source character when we're trying to say "span starts here"
• Rollup of Print out the output line that fails json parsing #33392 (which should help fix Spurious JSON parsing failure on bots #33390)

r? @nikomatsakis

[nikomatsakis]

@bors r+

[bors]

📌 Commit c1c1ad5 has been approved by nikomatsakis

[sanxiyn]

@bors r-

This failed tidy.

[sophiajt]

@bors r=nikomatsakis

[bors]

📌 Commit b0a317d has been approved by nikomatsakis

[bors]

⌛ Testing commit b0a317d with merge 0c5d651...

[bors]

☀️ Test successful - auto-linux-32-nopt-t, auto-linux-32-opt, auto-linux-32cross-opt, auto-linux-64-cargotest, auto-linux-64-cross-armhf, auto-linux-64-cross-armsf, auto-linux-64-cross-freebsd, auto-linux-64-cross-netbsd, auto-linux-64-debug-opt, auto-linux-64-nopt-t, auto-linux-64-opt, auto-linux-64-opt-mir, auto-linux-64-opt-rustbuild, auto-linux-64-x-android-t, auto-linux-cross-opt, auto-linux-musl-64-opt, auto-mac-32-opt, auto-mac-64-nopt-t, auto-mac-64-opt, auto-mac-64-opt-rustbuild, auto-mac-cross-ios-opt, auto-win-gnu-32-nopt-t, auto-win-gnu-32-opt, auto-win-gnu-32-opt-rustbuild, auto-win-gnu-64-nopt-t, auto-win-gnu-64-opt, auto-win-msvc-32-cross-opt, auto-win-msvc-32-opt, auto-win-msvc-64-cargotest, auto-win-msvc-64-opt, auto-win-msvc-64-opt-mir, auto-win-msvc-64-opt-rustbuild