bake: add execution mode - #4044
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This carries forward the syncable output work from #1197 and expands it into a general
--executionoption for Bake. The new option keeps the default behavior asfail-fast, addssync-outputso multi-target builds only write output after all selected targets reach the output boundary successfully, addsdefer-errorso independent targets can continue after another target fails, and supportsparallel=Nas a comma-separated execution option for limiting target concurrency.This addresses the same class of partial-output and multi-target coordination problems discussed in #1089, #1668, #3297, #3428, and #3989. The sync-output mode is the piece needed for atomic-ish local output across targets, including failures during ref evaluation such as missing files. The defer-error mode covers workflows that need all independent targets to finish before reporting failure. The parallel option provides explicit target-level concurrency control without changing BuildKit internal parallelism.