Add semantic error test for assignment to literal #7739

Job	Run time
Test PIP Installable Packages	2m 50s
Check Debug build	2m 44s
LPython CI (3.10, macos-latest)	4m 38s
LPython CI (3.10, ubuntu-latest)	9m 19s
Build LPython to WASM	5m 24s
LPython CI (3.10, windows-2025)	15m 21s
Run SymPy tests	3m 25s
Test LLVM 16	2m 48s
Test LLVM 15	2m 48s
Test LLVM 10	2m 52s
Run Integration tests with Python 3.10	3m 2s
Run Integration tests with Python 3.12	3m 19s
Run Integration tests with Python 3.9	3m 2s
Build Jupyter Kernel	3m 56s
Test CPython Interop (@pythoncall)	2m 50s
Run Integration tests with Python 3.11	3m 5s
Upload Tarball	56s
Check Release build	6m 23s
	1h 18m 42s

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