Add optional flag --host-chain to hermes upgrade clients

[ljoss17]

Summary

Add an optional flag to hermes upgrade clients in order to upgrade all clients on the host chain that are for the reference chain.

Problem Definition

Following the review comment for the ADR providing recommendations for Hermes commands, #2306 (comment), the upgrade clients requires the implementation of an optional flag.

This would allow to upgrade the clients which reference a chain on a specified host chain.

Proposal

The Upgrade clients command should take the optional flag [--host-chain <HOST_CHAIN_ID>].
The flag would specify on which chain the clients should be upgraded.

Acceptance Criteria

• [--host-chain <HOST_CHAIN_ID>] is implemented for the upgrade clients command.
• Hermes guide is updated with the new optional flag.

---

For Admin Use

• Not duplicate issue
• Appropriate labels applied
• Appropriate milestone (priority) applied
• Appropriate contributors tagged
• Contributor assigned/self-assigned