STYLE/PERF: replace string concatenations with f-strings in core #49518
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Doing less concatenations and explicit cast calls in the core is likely to yield some performance improvements (see https://twitter.com/raymondh/status/1205969258800275456).
Split out of #49229.
Refs #29547 (a 2019 issue tracking replacing formatting with better alternatives)
doc/source/whatsnew/vX.X.X.rst
file if fixing a bug or adding a new feature.