Avoid dangling-pointer usage in pg_basebackup progress reports.

Ill-considered refactoring in 23a1c6578 led to progress_filename
sometimes pointing to data that had gone out of scope.  The most
bulletproof fix is to hang onto a copy of whatever's passed in.
Compared to the work spent elsewhere per file, that's not very
expensive, plus we can skip it except in verbose logging mode.

Per buildfarm.

Discussion: https://postgr.es/m/20220212211316.GK31460@telsasoft.com

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