Merge #14683: tests: better combine_logs.py behavior

4aabadbf44 tests: have combine_logs default to most recent test dir (James O'Beirne)

Pull request description:

  Have `combine_logs.py` default to the most recent test directory if no argument is provided. This allows you to avoid an annoying copy-paste when iterating on a failing test, since you can do something like
  ```sh
  alias testlogs='./test/functional/combine_logs.py -c | less'

  ./test/functional/some_test.py  # fails
  testlogs
  ```

Tree-SHA512: 919642ab09c314888a23c9491963b35b9da87e60deb740d1d5e816444aa9bdda5e519dc8ca131669f2d563167ef5f5abb14e22f20f47bf8362915ed578181846

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