Refactoring: Remove usage of deprecated LocalDirs field in SolveOpts #2570

Job	Run time
prepare	4s
binaries (darwin/amd64)	59s
binaries (darwin/arm64)	59s
binaries (linux/amd64)	2m 7s
binaries (linux/arm/v7)	2m 6s
binaries (linux/arm64)	2m 5s
binaries (linux/s390x)	2m 13s
binaries (linux/ppc64le)	2m 27s
binaries (linux/riscv64)	2m 11s
binaries (windows/amd64)	1m 3s
binaries (windows/arm64)	1m 9s
test / prepare	1m 51s
test / run (containerd, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	6m 42s
test / run (containerd-rootless, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integr...	7m 53s
test / run (containerd-1.6, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	6m 36s
test / run (containerd-snapshotter-stargz, ./client ./cmd/buildctl ./worker/containerd ./solver ./fronte...	7m 15s
test / run (oci, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	4m 57s
test / run (oci-rootless, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	4m 51s
test / run (oci-rootless-slirp4netns-detachnetns, ./client ./cmd/buildctl ./worker/containerd ./solver ....	5m 2s
test / run (oci-snapshotter-stargz, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, int...	5m 14s
test / run (./..., 1, integration gateway)	4m 5s
test / run (./client, containerd, nydus, integration)	6m 45s
test / run (./client, oci, nydus, integration)	4m 47s
test / run (./..., nydus, 1, integration)	3m 57s
image	8m 0s
image (rootless)	8m 43s
release	30s
	1h 44m 31s

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