Change Camera.viewport_to_world_2d to rescale according to the rendering target's scaling factor #55794

Job	Run time
miri	12m 8s
build (windows-latest)	9m 12s
check-doc	9m 41s
build (ubuntu-latest)	6m 2s
ci	2m 40s
build (macos-latest)	5m 0s
run-examples-macos-metal	4m 45s
toml	2m 1s
typos	7s
check-bevy-internal-imports	4s
check-missing-examples-in-docs	28s
check-missing-features-in-docs	27s
markdownlint	1m 10s
check-compiles	5m 21s
check-compiles-no-std	1m 21s
build-wasm-atomics	1m 42s
msrv	1m 1s
build-wasm	1m 10s
	1h 4m 20s

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