Disable pvf subprocess

[kamilsa]

Referenced issues

Related to #2123

Description of the Change

• Disables PVF subprocess and speeds up PVF execution until [Bug]: Slow PVF execution in separate process #2123 is fixed
• Removes --unsafe-cached-wavm-runtime flag (wavm runtimes are obtained from cache when possible)

Possible Drawbacks

Less secure PVF execution

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