Protect against XSS in diff-view by using application/json #5476

Job	Run time
Build Linux dev	20m 26s
Windows 2019/x64	1h 31m 30s
Build Linux package amd64	26m 19s
Build Linux package arm64	16m 52s
macOS 12/x86_64	1h 9m 34s
Build Linux dev+vendor	2m 30s
Install-check: tgz-ubuntu-22.04/amd64	35s
Install-check: ubuntu-22.04/amd64	35s
Install-check: ubuntu-20.04/amd64	35s
Install-check: ubuntu-18.04/amd64	45s
Install-check: debian-stable/amd64	31s
Install-check: debian-oldstable/amd64	36s
Install-check: amazonlinux-2023/amd64	40s
Install-check: fedora-latest/amd64	1m 21s
Install-check: almalinux-9/amd64	51s
Install-check: almalinux-8/amd64	38s
Install-check: tgz-ubuntu-22.04/arm64	36s
Install-check: ubuntu-22.04/arm64	47s
Install-check: ubuntu-20.04/arm64	39s
Install-check: ubuntu-18.04/arm64	42s
Install-check: debian-stable/arm64	37s
Install-check: debian-oldstable/arm64	42s
Install-check: amazonlinux-2023/arm64	50s
Install-check: fedora-latest/arm64	1m 16s
Install-check: almalinux-9/arm64	42s
Install-check: almalinux-8/arm64	43s
	4h 1m 52s

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