jenkins test: clear singing-key-fingerpring from previous run

2 jobs for 428-Signature-key-fingerprint-of-file-stats-publishsigkeys-jar-does-not-match-repo_key_sha256-in-config-py in 47 minutes and 38 seconds (queued for 4 minutes and 13 seconds)
Status Job ID Name Coverage
  Test
passed #44449350
metadata_v0

00:06:46

passed #44449349
test

00:47:38