[v16.x backport] test: add test for position validation in fs.read() and fs.readSync() #43588
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Backport of: #42837 and #42999.PRs that contain new features and should be released in the next minor version.
Conflict caused by: #42768 semver-minor
/cc @danielleadams
1656e1b is the same as 6be94c9, but it's absent on current
v16.x-stagingbranch and backported commit depends on it. Please let me know if I should rebase to keep only ceee7be backported.