Bench/ssd cluster

[fmaste]

Description

• Make profiles' "cluster" property null when not used (it had an "empty" value).
• Move the "ssd_directory" profile property from "cluster" to "node", it's a node config that may or may not be related to what's defined in "cluster".
• Switch producers instance types from "c5.2xlarge" to "c5d.2xlarge".
• Allow defining Nomad volumes only for producer nodes (node that are not the explorer).
• Add LMDB profile with its Nomad volume.
• Checked with dyff between that final changes to "all-profiles-coay.json" makes sense!

Add your description here, if it fixes a particular issue please provide a
link
to the issue.

Checklist

• Commit sequence broadly makes sense and commits have useful messages
• New tests are added if needed and existing tests are updated. These may include:
  • golden tests
  • property tests
  • roundtrip tests
  • integration tests
    See Runnings tests for more details
• Any changes are noted in the CHANGELOG.md for affected package
• The version bounds in .cabal files are updated
• CI passes. See note on CI. The following CI checks are required:
  • Code is linted with hlint. See .github/workflows/check-hlint.yml to get the hlint version
  • Code is formatted with stylish-haskell. See .github/workflows/stylish-haskell.yml to get the stylish-haskell version
  • Code builds on Linux, MacOS and Windows for ghc-9.6 and ghc-9.12
• Self-reviewed the diff

Note on CI

If your PR is from a fork, the necessary CI jobs won't trigger automatically for security reasons.
You will need to get someone with write privileges. Please contact IOG node developers to do this
for you.