test(render): drop strokes from terrain-extension-drape

[chrisgervang]

Background

terrain-extension-drape was the slowest test in CI (21.9s), mostly GPU time spent draping the GeoJsonLayer strokes into each terrain tile's cover texture under SwiftShader.

Change List

• terrain-extension-drape drapes fills only (stroked: false)
• Golden image terrain-extension-drape.png regenerated without strokes
• Render tests: 21.9s → 4.9s on CI, measured with the timing reporter in chore(test): per-file test timing in CI (diagnostic, do not merge) #10844
• Mercator draped strokes are no longer covered; the globe twin already omits them

Before	After

[coveralls]

coverage: 83.517%. remained the same — chr/faster-slow-tests into master

[chrisgervang]

I'd prefer to go with solving a root cause in #10851