video_core: keep task/mesh pipelines out of the disk pipeline cache

Task and mesh programs are translated with the mesh registers and the
pass-through geometry header, which the cache format does not carry: a
stored pipeline loaded them as zero ("Mesh output topology 0"). Do not
store these pipelines and skip any that were stored, so the format and
CACHE_VERSION stay as they are (a version change would delete the cache
other builds share). The topology error also shows SET_MESH_SHADER_A.

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