chore: check if wasm compiler is already downloaded

[galargh]

• Because this PR includes a bug fix, relevant tests have been included.
• Because this PR includes a new feature, the change was previously discussed on an Issue or with someone from the team.
• I didn't do anything of this.

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When updating how solidity compilers are downloaded, I forgot to add a check if a compiler is already downloaded before the call to download the wasm compiler. This PR fixes that.

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Latest commit: d341544

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[schaable]

Looks good!