Adds Oval rendering to the UberSDF shader, uses UberSDF oval rendering in the canvas behind the feature flag. The SDF doesn't actually find the minimum distance to the oval, it find the distance from the test point to the center of the oval along a straight line - visually looks good though. Fixes #183037. Before this change: <img width="803" height="628" alt="before" src="https://github.com/user-attachments/assets/2a662e3b-3cb2-4ff5-81b1-14dd16457304" /> After this change: <img width="803" height="628" alt="after" src="https://github.com/user-attachments/assets/52985b3d-f2a1-41ff-a05a-c35d9f0198c6" /> Diffs highlighted: <img width="803" height="628" alt="diff" src="https://github.com/user-attachments/assets/fdfdda2a-d9f9-4f18-8cd5-50f96c09718c" /> ## Pre-launch Checklist - [ ] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [ ] I read the [AI contribution guidelines] and understand my responsibilities, or I am not using AI tools. - [ ] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [ ] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [ ] I signed the [CLA]. - [ ] I listed at least one issue that this PR fixes in the description above. - [ ] I updated/added relevant documentation (doc comments with `///`). - [ ] I added new tests to check the change I am making, or this PR is [test-exempt]. - [ ] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [ ] All existing and new tests are passing.

Add Oval SDF renderer to uber shader #183037

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