Add error message when overlapping fullstack features are enabled #3921

Job	Run time
Check	6m 48s
Clippy	7m 12s
Rustfmt	18s
Test Suite	21m 37s
matrix_test (x86_64-pc-windows-msvc, windows-latest, 1.70.0, false, test, --all --tests)	22m 45s
matrix_test (x86_64-apple-darwin, macos-latest, 1.70.0, false, test, --all --tests)	17m 23s
matrix_test (aarch64-apple-ios, macos-latest, 1.70.0, false, build, --package dioxus-mobile)	2m 44s
matrix_test (aarch64-linux-android, ubuntu-latest, 1.70.0, true, build, --package dioxus-mobile)	3m 53s
	1h 22m 40s

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