[PATCH v2 0/4] leak tests: mark remaining tests leak-free as such

Here is a reroll of my (I guess now mine and Peff's!) series to update our test scripts to accurately mark which ones are leak-free.

This is mostly unchanged from the previous round, modulo cleaning up the first (now second) patch's message, and inserting a new patch from Peff at the beginning to ignore noisy LSan output.

Thanks in advance for your review!

Jeff King (1):
  test-lib: ignore uninteresting LSan output

Taylor Blau (3):
  leak tests: mark a handful of tests as leak-free
  leak tests: mark t3321-notes-stripspace.sh as leak-free
  leak tests: mark t5583-push-branches.sh as leak-free

 t/t3321-notes-stripspace.sh | 1 +
 t/t5571-pre-push-hook.sh    | 1 +
 t/t5583-push-branches.sh    | 1 +
 t/t7516-commit-races.sh     | 2 ++
 t/test-lib.sh               | 1 +
 5 files changed, 6 insertions(+)

Range-diff against v1:
-:  ---------- > 1:  7dd42212c0 test-lib: ignore uninteresting LSan output
1:  b1711c4c81 ! 2:  164f37cade leak tests: mark a handful of tests as leak-free
    @@ Commit message
         'ab/mark-leak-free-tests', 2021-10-25), a handful of tests in the suite
         were marked as leak-free.
     
    -    As far as I can tell, each patch from that series ran tests from a
    -    handful of subject areas, such as "some ls-files tests", or "all trace2
    -    tests". This left some gaps in which tests had and hadn't been audited
    -    to be leak-free.
    +    Since then, a handful of tests have become leak-free due to changes like
     
    -    This patch closes those gaps by exporting TEST_PASSES_SANITIZE_LEAK=true
    -    before sourcing t/test-lib.sh on most remaining leak-free tests. This
    -    list was compiled by doing:
    +      - 861c56f6f9 (branch: fix a leak in setup_tracking, 2023-06-11), and
    +      - 866b43e644 (do_read_index(): always mark index as initialized unless
    +        erroring out, 2023-06-29)
    +
    +    , but weren't updated at the time to mark themselves as such. This leads
    +    to test "failures" when running:
     
             $ make SANITIZE=leak
    -        $ make \
    +        $ make -C t \
                 GIT_TEST_PASSING_SANITIZE_LEAK=check \
                 GIT_TEST_SANITIZE_LEAK_LOG=true \
                 GIT_TEST_OPTS=-vi test
     
    -    and looking through the list of failing tests in the output.
    +    This patch closes those gaps by exporting TEST_PASSES_SANITIZE_LEAK=true
    +    before sourcing t/test-lib.sh on most remaining leak-free tests.
     
         There are a couple of other tests which are similarly leak-free, but not
         included in the list of tests touched by this patch. The remaining tests
         will be addressed in the subsequent two patches.
     
    +    Helped-by: Jeff King <peff@peff.net>
         Signed-off-by: Taylor Blau <me@ttaylorr.com>
     
      ## t/t5571-pre-push-hook.sh ##
2:  cfeca88942 = 3:  116555fc02 leak tests: mark t3321-notes-stripspace.sh as leak-free
3:  4011eb6a8b = 4:  a16a0b2cac leak tests: mark t5583-push-branches.sh as leak-free