Get rid of 'master' in favor of 'default-branch' in CI config [RUN ALL RSPEC]

Rémy Coutablerequested to merge
get-rid-of-master-in-ci-config into master

What does this MR do?

This is mostly a renaming to transition from master to default-branch/$CI_DEFAULT_BRANCH where applicable in the CI config.

Edited by Albert Salim

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