Trim trailing empty strings when converting to f-strings #21755

Job	Run time
cargo clippy	1m 51s
cargo fmt	12s
cargo fuzz	4m 36s
cargo test (linux)	3m 53s
cargo test (wasm)	1m 7s
cargo test (windows)	4m 42s
benchmarks	9m 12s
cargo udeps	1m 55s
Determine changes	8s
mkdocs	2m 16s
pre-commit	33s
python package	1m 10s
test scripts	47s
formatter instabilities and black similarity	0s
test ruff-lsp	19s
ecosystem	7m 50s
	40m 31s

Provide feedback