Disable failing MariaDB tests

[justsmth]

Issues:

P112867839

Description of changes:

• Several MariaDB tests are failing, blocking our CI approval process.

Call-outs:

• The 3 failing tests are reporting the error: TLS/SSL error: unable to get local issuer certificate
  

  aws-lc/crypto/x509/x509_vfy.c

  Line 413 in 56def5a

  ctx->error = X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY;

...
  // If not explicitly trusted then indicate error unless it's a single
  // self signed certificate in which case we've indicated an error already
  // and set bad_chain == 1
  if (trust != X509_TRUST_TRUSTED && !bad_chain) {
    if ((chain_ss == NULL) || !ctx->check_issued(ctx, x, chain_ss)) {
      if (ctx->last_untrusted >= num) {
        ctx->error = X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY;  //  <<-- FROM THIS LINE 
      } else {
        ctx->error = X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT;
      }
      ctx->current_cert = x;
...

Testing:

MariaDB tests passing in personal account.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.