ci: improve circle ci setup

[alan-agius4]

With this change we introduce a couple of changes

• Do yarn install and code checkout once in the setup phase
• Save cache in build-packages-dist to ensure that we cache Bazel action outputs at the very end of our builds so that we will later get better cache hit rate
• We use circle ci 2.1 features such as action executors and commands
• Removed the bazel-lint task which was redundant
• We save yarn cache to circli ci cache instead of node_modules directory
• Use a cache key fallback, so to use the last cached version when a dependency is updated.

[alan-agius4]

@vikerman can you please remove bazel-lint from being a required task in github?

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