fix(test): keep projection setup out of unrelated runs

[yordis]

• keep non-projection test runs focused on the code they exercise instead of paying an unconditional database setup cost
• move projection database boot into the application path that actually needs it so setup work happens only when those tests opt in

[cursor]

PR Summary

Low Risk
Low risk: test-only changes that move Postgres repo/migration setup behind an explicit TestApplication init path, reducing unnecessary DB work; main risk is missing initialization if a test relies on projections without booting the app.

Overview
Moves projection database bootstrapping out of test_helper.exs and into an explicit, opt-in path.

Adds Commanded.TestSupport.ProjectionsSetup (a GenServer) to lazily start the projections Repo, run a one-off migration to create the projections table, and set SQL sandbox mode, and wires it into TestApplication.init/1 while test_helper.exs now only starts the setup server.

^{Reviewed by Cursor Bugbot for commit d8c924d. Bugbot is set up for automated code reviews on this repo. Configure here.}

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 0e679cb8-18ce-4e42-9aab-23c6fdc09f82

📥 Commits

Reviewing files that changed from the base of the PR and between 91a612f and 0782b79.

📒 Files selected for processing (11)

• mix.exs
• test/projections/after_update_callback_test.exs
• test/projections/commanded_batch_integration_test.exs
• test/projections/ecto_projection_batch_test.exs
• test/projections/ecto_projection_test.exs
• test/projections/init_callback_test.exs
• test/projections/projection_version_schema_prefix_test.exs
• test/projections/support/ecto_case.ex
• test/projections/support/setup.ex
• test/support/mock_projection_case.ex
• test/test_helper.exs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch yordis/fix-test-helper-boot

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