Backport of tests: don't mutate global structs in core scheduler tests into release/1.3.x #16124
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Backport
This PR is auto-generated from #16120 to be assessed for backporting due to the inclusion of the label backport/1.3.x.
The below text is copied from the body of the original PR.
Some of the core scheduler tests need the maximum batch size for writes to be smaller than the usual
structs.MaxUUIDsPerWriteRequest. But they do so by unsafely modifying the global struct, which creates test flakes in other tests.Modify the functions under test to take a batch size parameter. Production code will pass the global while the tests can inject smaller values. Turn the
structs.MaxUUIDsPerWriteRequestinto a constant, and add a semgrep rule for avoiding this kind of thing in the future.Discovered while trying to debug #16112, but this should get backported to all supported versions whereas that will be only to 1.4.x