Remove Unencrypted Logs from Private Token Contract

[suyash67]

We emit unencrypted logs from the private functions in the private token contract. This leaks privacy (spotted original by Mike in #1689). But for the sandbox release, we still kept these unencrypted logs for the private token contract because it was being used in the docs to demonstrate retrieval of logs. Longer term, we should remove these unencrypted logs from this contract and update the docs to use a different example for retrieval of unencrypted logs.

aztec-packages/yarn-project/noir-contracts/src/contracts/private_token_contract/src/main.nr

Line 41 in ad1c2cb

emit_unencrypted_log(&mut context, "Balance set in constructor");

aztec-packages/yarn-project/noir-contracts/src/contracts/private_token_contract/src/main.nr

Line 65 in ad1c2cb

emit_unencrypted_log(&mut context, "Coins minted");

aztec-packages/yarn-project/noir-contracts/src/contracts/private_token_contract/src/main.nr

Line 94 in ad1c2cb

emit_unencrypted_log(&mut context, "Coins transferred");

Most (if not all) of such logs can be found by grepping 'TODO(1757)'

[benesjan]

Addressed by #1780