Heptapod CI: added diff_notes_spec to regular runs

Makes sense, since we changed it.

branch : heptapod
10 jobs for !334 with topic/heptapod-stable/migration-native-notes in 42 minutes and 52 seconds
merge request
Name Stage Failure
rspec-regular 2/8 Test
mercurial.error.RepoError: b"filtered revision 'ea1f8f73a67f230b84048f9098be7a89dff3cfd4' (not in 'served' subset)"
abort: filtered revision 'ea1f8f73a67f230b84048f9098be7a89dff3cfd4' (not in 'served' subset)!
Uploading artifacts for failed job
Uploading artifacts...
WARNING: knapsack/: no matching files
WARNING: log/: no matching files
ERROR: No files to upload
Cleaning up file based variables
ERROR: Job failed: exit code 1