`--commit-range` doesn't restrict the recommendations to changed files in that range

### Issue
When I run the cli command to get a security scan for a given commit range, it includes recommendations across the entire package rather than just the specified commit range.

### Steps to reproduce
1. Run `aws-codeguru-cli --root-dir . --profile --mode security --commit-range HEAD^:HEAD`
2. Observe the the file at `code-guru/recommendations.json` includes recommendations across your entire package.

### Expected Result
Only include recommendations that are part of the diff within the commit range.

### Notes
I tried removing the commit range and noticed that the output is identical which makes me think that the flag is ignored.

This seems related to #9 but I wasn't able to validate the output of the jobs mentioned in that query.

Run the reported aws-codeguru-cli command with and without --commit-range, then compare code-guru/recommendations.json. Trace the --commit-range entry point and review related issue #9; done means recommendations.json contains only recommendations for files changed in the specified commit range.

Written by the indexing model from the issue text.