fix: ccache settings for benchmarks and int tests

[antonbaliasnikov]

What ❔

• Fix ccache settings for benchmarks and int tests.
• Use RelWithDebInfo for integration tests, and Release LLVM build types for benchmarks.

Why ❔

To properly regen cache in LLVM repo and use it in benchmarks and integration tests.

Checklist

• PR title corresponds to the body of PR.
• Documentation comments have been added / updated.