Enable anisotropic filtering only beyond 20 degrees pitch

[stepankuzmin]

Enable anisotropic filtering on tiles beyond 20 degrees pitch to prevent it from compromising image crispness on flat or low-tilted maps. This is a backport from GL Native. Closes #7331

mapbox-gl-js/src/render/draw_raster.js

Lines 81 to 85 in a3ef365

	// Enable trilinear filtering on tiles only beyond 20 degrees pitch,
	// to prevent it from compromising image crispness on flat or low tilted maps.
	if (tile.texture.useMipmap && context.extTextureFilterAnisotropic && painter.transform.pitch > 20) {
	gl.texParameterf(gl.TEXTURE_2D, context.extTextureFilterAnisotropic.TEXTURE_MAX_ANISOTROPY_EXT, context.extTextureFilterAnisotropicMax);
	}

Also:

• Update Docker Image to the latest Node v14
• Lower the baseline for some render tests mostly because Firefox results are slightly different from Chrome in some tests
• Bumps puppeteer-core and selenium-webdriver to the latest versions

Launch Checklist

• briefly describe the changes in this PR
• write tests for all new functionality
• apply changelog label ('bug', 'feature', 'docs', etc) or use the label 'skip changelog'
• add an entry inside this element for inclusion in the mapbox-gl-js changelog: <changelog>Enable anisotropic filtering on tiles beyond 20 degrees pitch to prevent it from compromising image crispness on flat or low-tilted maps.</changelog>

[mourner]

Looks good to me! One final thing I'd check just in case is that the filter on draw doesn't incur any performance penalties, but otherwise good to go. Not sure what's going on with the CodeBuild failing but I guess that's a fluke.

[stepankuzmin]

I've run a benchmap, and it seems that the fix doesn't affect the rendering performance https://sites.mapbox.com/benchmap-js-results/runs/1358