Add semantic error test for assignment to literal #7738

Job	Run time
Test PIP Installable Packages	4m 19s
LPython CI (3.10, ubuntu-latest)	9m 22s
Build LPython to WASM	3m 54s
LPython CI (3.10, windows-2025)	15m 27s
LPython CI (3.10, macos-latest)	4m 57s
Test CPython Interop (@pythoncall)	5m 5s
Run Integration tests with Python 3.12	4m 18s
Run Integration tests with Python 3.10	4m 16s
Test LLVM 16	4m 2s
Run SymPy tests	4m 24s
Test LLVM 15	3m 54s
Check Debug build	4m 7s
Run Integration tests with Python 3.11	4m 23s
Test LLVM 10	3m 59s
Build Jupyter Kernel	3m 56s
Upload Tarball	55s
Run Integration tests with Python 3.9	4m 6s
Check Release build	7m 54s
	1h 33m 18s

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