[MRF-13.5] PLU-520: (frontend) refactor contexts #1292

This check will pass when downstack PRs merge

#1290 needs to be merged into mrf/trunk before you can merge this PR.
- This PR is stacked on top of #1290. Merging this PR on GitHub will cause it to merge incorrectly into #1290 instead of mrf/trunk.
- Learn more about stacked PRs here
To ensure that these PRs merge correctly, view and merge this PR with Graphite
To disable this check, edit your organization's settings on Graphite.