Cleanup: remove all the module.exports

[elasticmachine]

Original comment by @tsullivan:

LINK REDACTED

After LINK REDACTED we'll have suppressed import/default warnings due to a lot of files still using module.exports. In some cases, this is necessary - for example: webShims and gulp_helpers. We'll have to add a comment to disable warning about those cases. In other places, for example: plugins/graph/public/graphClientWorkspace.js, we need to replace with export syntax.

Related to #12084

[elasticmachine]

Original comment by @w33ble:

Just a note, the export transform in LINK REDACTED will do most of the heavy lifting here. You just need to review the output and make tweaks at that point. That's how I created the PR in Kibana.

[elasticmachine]

Original comment by @tsullivan:

Much of this also waits on #12084

[tsullivan]

This has been implemented