GnuTLS | assorted test stability improvements (!2059)

Alexander Sosedkin created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/2059

Project:Branches: asosedkin/gnutls:tests-assorted-stability to gnutls/gnutls:master
Author:   Alexander Sosedkin



<!-- Add a description of the new feature/bug fix. Reference any relevant bugs. -->

Should fix a few CI failures, all probabilistic and sorta rare:
- tests/suite/tls-fuzzer: exclude test‑tls13‑finished.py padding tests
  as gnutls sends NST early (explicitly valid by RFC8446 4.6.1)
  and that races against sending malformed Finished.
- tests/resume.c: use a callback for processing NST data
  This is supposed to avoid a rare race condition with NST coming late.
  The callback and its use are taken from tests/tls13/hello_retry_request_resume.c
- tests/suite/testrng.sh: shorten with a helper, check ./rng return code
- tests/cert-reencoding.sh: clean up, valgrind, force IPv4

## Checklist
 * [x] Commits have `Signed-off-by:` with name/author being identical to the commit author
 * [ ] Code modified for feature
 * [ ] Test suite updated with functionality tests
 * [ ] Test suite updated with negative tests
 * [ ] Documentation updated / NEWS entry present (for non-trivial changes)

## Reviewer's checklist:
 * [ ] Any issues marked for closing are addressed
 * [ ] There is a test suite reasonably covering new functionality or modifications
 * [ ] Function naming, parameters, return values, types, etc., are consistent and according to `CONTRIBUTION.md`
 * [ ] This feature/change has adequate documentation added
 * [ ] No obvious mistakes in the code

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