Modified proxy function in ttir_builder and added MNIST golden test (… #499

Job	Run time
build-and-test / build-image	11s
pre-commit / pre-commit	14s
spdx / check-spdx-headers	4s
build-and-test / Lint (clang-tidy)	26m 50s
build-and-test / Build and test tt-explorer (n150, ON, perf)	16m 56s
build-and-test / Build tt-mlir (ubuntu-latest, OFF, OFF, run)	20m 36s
build-and-test / Build tt-mlir (ubuntu-latest, ON, OFF, perf)	22m 41s
build-and-test / Build tt-mlir (ubuntu-latest, OFF, ON, op_model)	20m 10s
build-and-test / run-runtime-api-tests (n150, OFF, run)	3m 12s
build-and-test / run-ttrt-tests (n150, ON, perf)	10m 12s
build-and-test / run-tests (n150, OFF, run)	5m 0s
build-and-test / run-tests (n150, ON, perf)	7m 21s
build-and-test / run-tests (n300, OFF, run)	5m 56s
build-and-test / run-tests (n300, ON, perf)	10m 3s
	2h 29m 26s

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