[Docs Update] Squash and Merge workflow

[aj-codecov]

Description

Document how we support workflows that utilize squashing and merging

Page(s)

Might be a new page that specifically focused on how we support different merging workflows

Current State

[X] Missing Information

Additional Information

Originated from a survey of our team plan users where one user called out the lack of any documentation around how we support this workflow, but don't actually let people know that we do or how best to configure Codecov in this use case.