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gallium: Remove `PIPE_CAP_RGB_OVERRIDE_DST_ALPHA_BLEND`

Lucas Fryzek requested to merge Hazematman/mesa:lfryzek/default_rgb_dst_alpha_override into main

Since the mesa state tracker can promote RGB texture formats to RGBA texture formats (among other formats) without exposing any of that information to a driver, it is more desirable to have the behaviour of PIPE_CAP_RGB_OVERRIDE_DST_ALPHA_BLEND be the default. This avoids rendering bugs where an application sets DST_ALPHA blending on a format where there is no alpha channel, that has been promoted to a format that actually has an alpha channel. The driver can instead rely on the common code in the state tracker to convert the blending parameter to one that reflects the limitations of the application requested format, as long as PIPE_CAP_INDEP_BLEND_FUNC is supported.

Edited by Lucas Fryzek

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