add code coverage report into PRs

[Alan Barzilay]

As discussed in PR #415, we should add code coverage reports into PRs as part of the test workflow.

possible implementation with Code Coverage Report:

            - name: Produce the coverage report
              uses: insightsengineering/coverage-action@v2
              with:
		path: coverage.xml
		# Publish the rendered output as a PR comment
		publish: true
		# Create a coverage diff report.
		diff: true
		# Branch to diff against.
		diff-branch: next
		# This is where the coverage reports for the
		# `diff-branch` are stored.
		diff-storage: _xml_coverage_reports
		togglable-report: true

[Alan Barzilay]

this issue is currently blocked due to bots lack of permissions