feat(data_requests): increase max witnesses on testnet and dev envs

Originally by @guidiaz in b4a73d6
with edits from @drcpu-github

# Conflicts:
#	node/src/actors/chain_manager/mod.rs

Author: aesedepece

node/src/actors/chain_manager/mod.rs

@@ -5189,7 +5189,7 @@ mod tests {
         // Unstake all for validator 2
         process_unstake_transactions(
             &mut stakes,
-            [unstake_txn_1.clone()].iter(),
+            [unstake_txn_1.clone()],
             block_epoch,
             10_000_000_000_000,
         )
@@ -5254,7 +5254,7 @@ mod tests {
         // Unstake all again for validator 2
         process_unstake_transactions(
             &mut stakes,
-            [unstake_txn_2].iter(),
+            [unstake_txn_2],
             block_epoch,
             10_000_000_000_000,
         )