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ba95d94b - [ty] Infer `LiteralString` for `f"{literal_str_a} {literal_str_b}"` (#23346)

[ty] Infer `LiteralString` for `f"{literal_str_a} {literal_str_b}"` (#23346) ## Summary * The first commit modernizes the `LiteralString` test suite. * The second commit adds more precise type inference for `f"{literal_str_a} {literal_str_b}"` to make a conformance test pass. ## Test Plan Updated and new Markdown tests