build: Add a --show-duration option to the SCM test-driver.
* build-aux/test-driver.scm (script-version): Update. (show-help): Document it. (%options): Add the 'show-duration' option. (test-runner-gnu): Pass as a new argument. [test-cases-start-time]: New inner variable. [test-on-test-begin-gnu]: New hook, used to record the start time. [test-on-test-end-gnu]: Conditionally print elapsed time. Record it as the optional metadata in the test result file (.trs). * doc/guix.texi (Running the Test Suite): Document it.
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