[Task (SC-Platform)]: Fix iota-core unsafe precondition violation for slice::from_raw_parts

[PhilippGackstatter]

Description

These are from current develop (79d0e352dab06a80100ba08f730acd06c2755f24) when running cargo nextest run --package iota-core {test_name} with the respective test name.

--- STDERR:              iota-core authority::authority_store_pruner::pprof_tests::ensure_no_tombstone_fragmentation_in_stack_frame_with_ignore_tombstones ---
thread 'authority::authority_store_pruner::pprof_tests::ensure_no_tombstone_fragmentation_in_stack_frame_with_ignore_tombstones' panicked at library/core/src/panicking.rs:220:5:
unsafe precondition(s) violated: slice::from_raw_parts requires the pointer to be aligned and non-null, and the total size of the slice not to exceed `isize::MAX`
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
thread caused non-unwinding panic. aborting.

and

--- STDERR:              iota-core authority::authority_store_pruner::pprof_tests::ensure_no_tombstone_fragmentation_in_stack_frame_after_flush ---
thread 'authority::authority_store_pruner::pprof_tests::ensure_no_tombstone_fragmentation_in_stack_frame_after_flush' panicked at library/core/src/panicking.rs:220:5:
unsafe precondition(s) violated: slice::from_raw_parts requires the pointer to be aligned and non-null, and the total size of the slice not to exceed `isize::MAX`
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
thread caused non-unwinding panic. aborting.

This requires an investigation first where this error comes from, as no one has looked into it yet.

[DaughterOfMars]

There is already an issue for this #958

[lzpap]

There is already an issue for this #958

@DaughterOfMars since you closed this issue, please copy over the context to the already existing one. #958 doesn't have any meaningful info on what tests are failing, hence we did not find it with @PhilippGackstatter when we looked into the problem.