Rename status labels for Arbitrum blocks and transactions

[akolotov]

On the instances responsible for Arbitrum-like chains it is necessary to re-consider labels displaying for the transactions and blocks:

1. There should be an environment variable which could configure the parent chain name displayed in the labels. So, the labels will be composed like:

• Processed on rollup (without changes)
• Sent to ${L1_CHAIN}
• Confirmed on ${L1_CHAIN}

2. If the environment variable is not configured, the default statuses must be:

• Processed on rollup (without changes)
• Sent to parent chain
• Confirmed on parent chain