Revert "feat: syntax highlighting terminal output with Shiki" (#3023) #6015

Job	Run time
check-translations	44s
compile	1m 15s
knip	1m 2s
test-extension (ubuntu-latest)	2m 31s
test-webview (ubuntu-latest)	1m 28s
test-extension (windows-latest)	3m 36s
test-webview (windows-latest)	2m 56s
check-openrouter-api-key	1s
integration-test	1m 46s
unit-test	1s
	15m 20s

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