Re-add DummyUnit import to defaultunits.lua

[lL1l1]

Issue

Reported on Discord.
BrewLAN_Units Research & Daiquiris mod expected class DummyUnit in defaultunits.lua

info: Hooked /lua/defaultunits.lua with /mods/brewlan/hook/lua/defaultunits.lua
info: Hooked /lua/defaultunits.lua with /mods/brewlan_units/brewresearch/hook/lua/defaultunits.lua
...
warning: ...data\faforever\gamedata\lua.nx2\lua\defaultunits.lua(147): access to nonexistent global variable "DummyUnit"

The reference was removed in #3697 due to the PRs #3441 and #3636 moving the class to Unit.lua.

Description of the proposed changes

Add back the reference to the defaultunits.lua file.

Testing done on the proposed changes

Loaded the mod with the changes and the game started successfully with no errors.

Checklist

• Changes are annotated, including comments where useful
• Changes are documented in a changelog snippet according to the guidelines.
• Request 2-3 reviewers from the list of reviewers and their areas of knowledge.

Summary by CodeRabbit

• Bug Fixes
  • Restored the missing DummyUnit compatibility import, resolving mod compatibility issues for BrewLAN Research & Daiquiris.
• Documentation
  • Added a changelog entry documenting the compatibility fix.

[coderabbitai]

📝 Walkthrough

Walkthrough

Changes

DummyUnit compatibility

Layer / File(s)	Summary
Restore DummyUnit import lua/defaultunits.lua, changelog/snippets/fix.7180.md	DummyUnit is imported from /lua/sim/unit.lua into defaultunits.lua, with a changelog entry documenting restored mod compatibility.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: garanas, basilisk3

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly summarizes the main change: re-adding DummyUnit to defaultunits.lua.
Description check	✅ Passed	Covers the issue, proposed changes, testing, and checklist; only the optional Additional context section is missing.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/default-units-dummy-unit-import

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