chore: remove unused simulation files and migrators

[oren-lava]

Description

Closes: #XXXX

I've removed the unused simulation files to clean up the codebase. I've also removed old migrators (kept the latest migrators for future reference)

---

Author Checklist

All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.

I have...

• read the contribution guide
• included the correct type prefix in the PR title, you can find examples of the prefixes below:
• confirmed ! in the type prefix if API or client breaking change
• targeted the main branch
• provided a link to the relevant issue or specification
• reviewed "Files changed" and left comments if necessary
• included the necessary unit and integration tests
• updated the relevant documentation or specification, including comments for documenting Go code
• confirmed all CI checks have passed

Reviewers Checklist

All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.

I have...

• confirmed the correct type prefix in the PR title
• confirmed all author checklist items have been addressed
• reviewed state machine logic, API design and naming, documentation is accurate, tests and test coverage

[github-actions]

Test Results

2 328 tests  +125   2 328 ✅ +126   26m 32s ⏱️ + 1m 40s
  122 suites  -  21       0 💤 ±  0 
    7 files   +  1       0 ❌  -   1 

Results for commit 1663328. ± Comparison against base commit 070f99e.