Enable the certificate chain cache in the client CLI

## Why

We want to provide options in the client CLI to use the different levels of cache and to provide tooling for the cache.

## What

Adapt the client CLI commands to support cache configuration for the certificate chain.

## How

- [ ] Use only the file system cache in the client CLI
- [ ] Add certificate chain file cache global `unstable` options for the client CLI (`--use-certificate-chain-cache` and `--certificate-chain-cache-path`)
- [ ] Add new `unstable` sub-command `tools cache reset` that allows to reset the cache
- [ ] Use the cache mode in the nightly tests (`bin` steps with Cardano stake distribution, multiple runs)

Start by locating the client CLI command definitions and the nightly tests' `bin` steps. Trace the existing certificate chain cache configuration, then implement the listed unstable options and `tools cache reset` command, use only the filesystem cache, and update the nightly cache-mode runs so each checklist item is covered.

Written by the indexing model from the issue text.