Since Ruby 2.7.2 comes with bundler v2.1.4 by default, we need to
upgrade the Gemfile.lock and bump the CI cache keys. We also need to
install bundler v1.17.3 to ensure a smooth transition for other
dependencies, like Gitaly.

Exclude development gems from QA bundle install since debaser doesn't
compile on Ruby 2.7.

This runs dedicated job only if all rspec jobs
are requested. This also ensures that this is
ignored when run in context of EE.

This additionally runs in 2h interval.

Gather all used feature flags by `touch'ing` file
in a `tmp/feature_flags/`.

Print as part of `rspec:coverage` that a given
feature flag is unused.

All docs link should use /ee not /ce

~"Style decision" is gone and ~"static analysis" got renamed.

This allows to DRY up the config a bit.

Signed-off-by: Rémy Coutable <remy@rymai.me>

* Upgrade license_finder to 6.0
* Upgrade license_finder configuration https://github.com/pivotal/LicenseFinder/blob/master/CHANGELOG.md

Approve docutils package

Signed-off-by: Rémy Coutable <remy@rymai.me>

Includes a docs change to test image

Security blog post is now performed in www-gitlab-com on Security group,
this commit updates the link in the template

Update from node@12.4 to node@12.18 and yarn@1.21 to yarn@1.22