Add sanitizers.supp

1 job for release/21.04 in 5 minutes and 27 seconds (queued for 26 minutes and 47 seconds)
Status Name Job ID Coverage
  Build
failed build_clazy_clang_tidy #96022

00:05:27

 
Name Stage Failure
failed
build_clazy_clang_tidy Build

-- Configuring incomplete, errors occurred!
See also "/builds/utilities/kdebugsettings/build/CMakeFiles/CMakeOutput.log".
Uploading artifacts for failed job
Uploading artifacts...
WARNING: JUnitTestResults.xml: no matching files
ERROR: No files to upload
Cleaning up file based variables
ERROR: Job failed: exit code 1