Repository without cache shouldn't commit

[fedejinich]

The BlockchainBuilder is trying to commit a repository with MutableTrieImpl, this doesn't make sense since MutableTrieImpl is not committing anything.

rskj/rskj-core/src/test/java/co/rsk/test/builders/BlockChainBuilder.java

Line 177 in f783c05

repository.commit();

This also has an impact on the MutableRepositoryTracked (will be introduced in StorageRent-RSKIP240).

It should be removed (I've run the test without that line, and everything it's ok).