[Backport release/v0.22] [MAPSPERF-137] Improve rendering performance of feature cutouts (internal-12265)

Backport of internal-11300 to `release/v0.22`.

Cherry-picked commits: 4f097f84f1fbb495e19c89ffe8c7701c151c9ec5

> [!WARNING]
> This backport has merge conflicts that need manual resolution.

cc @mapbox/gl-native
cc @mapbox/gl-js

---------

Co-authored-by: Lasse Lammi <lasse.lammi@mapbox.com>
Co-authored-by: Changelog autocreator bot <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Daniel Eke <daniel.eke@mapbox.com>
GitOrigin-RevId: 7375a9bbb72445ece1e7de8838f7beca885a0dcd

Author: 4 people

src/shaders/_prelude.fragment.glsl

@@ -4,6 +4,8 @@
 #ifdef DUAL_SOURCE_BLENDING
 layout(location = 0, index = 0) out vec4 glFragColor;
 layout(location = 0, index = 1) out vec4 glFragColorSrc1;
+#elif defined(FLOAT_RENDER_TARGET)
+layout(location = 0) out highp vec4 glFragColor;
 #else
 layout(location = 0) out vec4 glFragColor;
 #endif