Run codecov on PR and bump range

[matt-ramotar]

Description

Modifying our workflow to run codecov on PRs. Bumping min coverage range to 70

Type of Change

• [x] CI

Test Plan

N/A

Checklist:

Before submitting your PR, please review and check all of the following:

• [x] I have performed a self-review of my own code
• [x] My changes generate no new warnings
• [x] New and existing unit tests pass locally with my changes

Additional Notes:

Will chip away at code coverage in separate PRs