Force well ordered changing of `TT_METAL_HOME` (#1582) #485

Job	Run time
pre-commit / pre-commit	34s
build-and-test / build-image	10s
spdx / check-spdx-headers	3s
build-and-test / Build and test tt-explorer (n150, ON, perf)	15m 52s
build-and-test / Lint (clang-tidy)	24m 59s
build-and-test / Build tt-mlir (ubuntu-latest, OFF, OFF, run)	18m 6s
build-and-test / Build tt-mlir (ubuntu-latest, ON, OFF, perf)	19m 21s
build-and-test / Build tt-mlir (ubuntu-latest, OFF, ON, op_model)	18m 25s
build-and-test / run-ttrt-tests (n150, ON, perf)	9m 48s
build-and-test / run-runtime-api-tests (n150, OFF, run)	3m 6s
build-and-test / run-tests (n150, OFF, run)	5m 21s
build-and-test / run-tests (n150, ON, perf)	7m 41s
build-and-test / run-tests (n300, OFF, run)	5m 8s
build-and-test / run-tests (n300, ON, perf)	12m 22s
	2h 20m 56s

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