media: Add test coverage for VegaRtcManager

[havardholvik]

Description

We need to start somewhere. This change breaks out the calculation of spatial and temporal layers so they can be unit tested.

Testing

Automated tests should cover this, no functional change.

Checklist

• [x] My code follows the project's coding standards.
• [x] Prefixed the PR title and commit messages with the service or package name
• [x] I have written unit tests (if applicable).
• [ ] I have updated the documentation (if applicable).
• [x] By submitting this pull request, I confirm that my contribution is made under the terms of the MIT license.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 7320e547cb6c53adbe1a95701ab9002034ccb1b5

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

| Name | Type | | ------------------------ | ----- | | @whereby.com/media | Patch | | @whereby.com/core | Patch | | @whereby.com/browser-sdk | Patch |

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