Ensure renamed files are also considered changed

Ash McKenzierequested to merge
363061-rspec-undercoverage-job-can-be-unreliable-due-to-simplecov-results-minimal-test-runs into master

What does this MR do and why?

This MR aims to improve how tooling/bin/find_changes determines the list of changed files for an MR by also including the original file path (as well as the new file path) in the event a file has been renamed and hopefully result in improved reliability for the rspec:undercoverage job.

The improvement is based on the suggested fix at #363061 (comment 998265955).

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #363061 (closed)

Edited by Ash McKenzie

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