csp-report: ensure Sentry requests are made with SNI

[alxndrsn]

Closes #1406

What has been done to verify that this works as intended?

Added new tests.

Why is this the best possible solution? Were any other approaches considered?

Nginx config change seems reasonable and minimal. Tests were required to understand the minimum nginx config required.

How does this change affect users? Describe intentional changes to behavior and behavior that could have accidentally been affected by code changes. In other words, what are the regression risks?

Should remove browser console errors relating to CSP report.

Does this change require updates to documentation? If so, please file an issue here and include the link below.

No.

Before submitting this PR, please make sure you have:

• branched off and targeted the next branch OR only changed documentation/infrastructure (master is stable and used in production)
• verified that any code or assets from external sources are properly credited in comments or that everything is internally sourced

[matthew-white]

I filed the original issue, and I'm excited to see this PR to close it out. ✨ That said, I'm heads-down on #1152 at the moment, so I think it'd work best for someone else to review. Say @brontolosone or @sadiqkhoja?