Reduce noise in test output

[fvictorio]

This PR:

• Adds some licenses/pragmas to prevent some solc warnings in the test output
• Disables the compilation result log in a test that runs 100 compilations, by overriding a subtask in the fixture project. We can't just use quiet: true here because because the test is compiled fresh (after a hh clean).

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Latest commit: e45f8b4

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