[cluster-test] Disable recovery experiment by default
[cluster-test] Disable recovery experiment by default

Can be enabled with env var

Closes: #1984
Approved by: andll

libra/libra,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,libra/libra,aptos-labs/aptos-core,aptos-labs/aptos-core,libra/libra,aptos-labs/aptos-core,libra/libra,libra/libra,aptos-labs/aptos-core