Use any of the compression algorithms supported by journlad

**What I'd like:**
journald has support for `lz4`, `zstd`, `xz` and `zlib`. Enabling one of them will improve I/O. As part of this feature, we need to be sure that the fluent-bit and cloudwatch agents support the selected compression algorithm, as well as `journalctl` in the admin container.

**Any alternatives you've considered:**
Don't use compression for the journal

Start by tracing how journald compression is configured and how the fluent-bit and CloudWatch agents, plus journalctl in the admin container, consume the journal. Check support for lz4, zstd, xz, and zlib in each component; done means a supported choice can be enabled without breaking those consumers.

Written by the indexing model from the issue text.