Make the mock transaction less expensive #1025
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In order to find the root of the cargo workspace to find where all the transaction files live, the mock transaction shells out to
cargo metadata. However, this call is very expensive (~500ms per call) so we want to only do it once. This changes the mock transaction to cache the result.This can save several sections in tests where there are many mock transactions. This makes the cosmos test suite about 4 times faster on my machine (8s to 2s).