Remove `MLIR.Context.with_diagnostics/2` #1293

Job	Run time
Generate ID of release	1s
arm_docker (linux/arm64/v8, arm64, https://ziglang.org/download/0.13.0/zig-linux-aarch64-0.13.0.t...	5m 27s
NIF 24.2 (1.14)	4m 3s
arm_docker (linux/amd64, amd64, https://ziglang.org/download/0.13.0/zig-linux-x86_64-0.13.0.tar.xz)	2m 23s
NIF 26 (1.15)	4m 4s
	15m 58s

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