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[9.20] fix: dev: Stop using malloc_usable_size and malloc_size

bind-team-rw-api-rw-repo requested to merge backport-4880-dont-use-malloc_usable_size-9.20 into bind-9.20

The malloc_usable_size() can return size larger than originally allocated and when these sizes disagree the fortifier enabled by _FORTIFY_SOURCE=3 detects overflow and stops the named execution abruptly. Stop using these convenience functions as they are primary used for introspection-only.

Closes #4880 (closed)

Backport of MR !9400 (merged)

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