Fix failing render specs for MSAA defaults

[ggetz]

Description

Many rendering specs were failing locally after adjusting the MSAA default. This fixes them.

1. When the rendering context is too small (like many of the test, which run in a 1x1 canvas), it always appears black when MSAA is enabled.
2. Some tests explicitly need MSAA to be turned off, ie. line weight tests.

Issue number and link

N/A

Testing plan

Run specs locally. They should be passing (or in a similar state to main pre-#12158)

Author checklist

• I have submitted a Contributor License Agreement
• I have added my name to CONTRIBUTORS.md
• I have updated CHANGES.md with a short summary of my change
• I have added or updated unit tests to ensure consistent code coverage
• I have updated the inline documentation, and included code examples where relevant
• I have performed a self-review of my code

[github-actions]

Thank you for the pull request, @ggetz!

✅ We can confirm we have a CLA on file for you.

[ggetz]

@jjspace Can you please review?

[jjspace]

Can confirm after switching branches to run tests multiple times they now pass as I'd expect before my msaa pr. I'm sorry for missing them in that one 🙏