Rollup merge of #139528 - Zalathar:no-logfile, r=jieyouxu
compiletest: Remove the `--logfile` flag This flag is deprecated in libtest (#134283), and there's no evidence in-tree of this flag actually being passed to compiletest. For detailed information about test results, bootstrap parses JSON output from compiletest instead (#108659). As part of my experimental work on removing the libtest dependency from compiletest, it's useful to be able to disconnect libtest functionality that isn't needed.
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