chore(starknet_sierra_compile): define accessible-at-runtime out_dir env var

[Itay-Tsabary-Starkware]

Stack:

• chore(starknet_sierra_compile): define accessible-at-runtime out_dir env var #2455 ⬅
• chore(starknet_sierra_compile): move env var from run time to compile… #2454
• chore(blockifier): move env var from run time to compile time #2453
• chore(starknet_api): rely on env::current_dir() instead of CARGO_MANIFEST_DIR #2450
• chore(starknet_api): revert use get_packaget_dir instead of env var #2449

⚠️ Part of a stack created by spr. Do not merge manually using the UI - doing so may have unexpected results.

[reviewable-StarkWare]

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