yamllint: fix all yamllint line-length errors

Fix all line-length errors detected by yamllint:

yamllint -f parsable -c .yamllint $( find -regex '.*\.y[a]*ml' ) | \
  grep '(line-length)'

Using a limit is set to 100 columns, not touching the commandlines in
GitHub workflows (at least for now).

Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>