Merge branch 'tisaac/fix-checkpoint-private' into 'main'

Fix insertion of boundary conditions marked by label values

See merge request petsc/petsc!5384

Add a broken test for boundary condition insertion

make test search=dm_impls_plex_tests-ex61_0 FORCE=1 DIFF_NUMBERS=1

Shows that we need to fix CheckPoints_Private() to actually test the label valu

Add a broken test for boundary condition insertion

make test search=dm_impls_plex_tests-ex61_0 FORCE=1 DIFF_NUMBERS=1

Shows that we need to fix CheckPoints_Private() to actually test the label value before insertion

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