Bug 1435644 - Regenerate the security/manager/ssl test certificates and keys. r=franziskus, a=test-only

For this, I've uncommented the relevant bits in moz.build files, then:

  ./mach build security/manager
  for dir in $(rg GeneratedTestCertificate | grep security | cut -d : -f 1); do
    cp obj-x86_64-pc-linux-gnu/$(dirname $dir)/*.pem $(dirname $dir);
  done

And same with GeneratedTestKey / *.key. Also regenerate the signed apps and metadata for tests expecting specific dates.

MozReview-Commit-ID: C2bkSo6YYCU

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