Fix sonarqube not scanning dpc-portal

[jdettmannnava]

🎫 Ticket

https://jira.cms.gov/browse/DPC-3971

🛠 Changes

Reverted simplecov gem to 0.17

ℹ️ Context for reviewers

Sonarqube stopped processing portal code coverage on Mar 5; the day the rails upgrade was merged into master. As part of the upgrade simplecov was not pinned to 0.17. Simplecov 0.18+ breaking ci is a known issue.
There was comment (present in the other gemfiles) warning not to upgrade, but it was removed because for some reason, when I run bundle install after sshing into the docker container, it will fail if there are too many bytes in the Gemfile. I removed "extraneous" comments, which meant I missed this.

✅ Acceptance Validation

Ran the build and checked the coverage.

🔒 Security Implications

• This PR adds a new software dependency or dependencies.
• This PR modifies or invalidates one or more of our security controls.
• This PR stores or transmits data that was not stored or transmitted before.
• This PR requires additional review of its security implications for other reasons.

If any security implications apply, add Jason Ashbaugh (GitHub username: StewGoin) as a reviewer and do not merge this PR without his approval.

[kyeah]

The note about bundle install breaking because the Gemfile is too long is 🙈 Thanks for the fix!

[MEspositoE14s]

Seeing how long that issue thread has gone on, I'm not entirely optimistic a fix is inbound anytime soon from the developer.

[jdettmannnava]

The note about bundle install breaking because the Gemfile is too long is 🙈 Thanks for the fix!

The weird thing is it does not break when building the container, only when running inside the container.