Update Classic McEliece supression files

[praveksharma]

The constant time behaviour for Classic McEliece changed after #1470 merged. This PR updates the Valgrind suppression files for the constant time tests.

It is worth noting that the failures that Valgrind reports depend on the environment I'm running the constant time tests in. Valgrind reports additional errors when running on my machine's native build environment as opposed to the ci-ubuntu-focal-x86_64 docker image; this PR documents those additional errors.

All errors are documented as "issues" at the moment. A later review by a McEcliece expert to sort these errors into "issues" and "passes" would be beneficial .

This fixes #1515.

• [No] Does this PR change the input/output behaviour of a cryptographic algorithm (i.e., does it change known answer test values)? (If so, a version bump will be required from x.y.z to x.(y+1).0.)
• [No] Does this PR change the list of algorithms available -- either adding, removing, or renaming? Does this PR otherwise change an API? (If so, PRs in oqs-provider, OQS-OpenSSL, OQS-BoringSSL, and OQS-OpenSSH will also need to be ready for review and merge by the time this is merged.)

[bhess]

While updating the dilithium suppression files for #1537, I noticed that there are still some ct-errors with McEliece, see the log attached:
test_constant_time.txt