fix: allow re-instantiation of genesis contracts

[Jonathansumner]

Fixes indexer halting when re-instantiating genesis contracts without indexed store_code messages.

• removes halting requirement for a relevant store_code msg entity.

---

Code Review Checklist (to be filled out by reviewer)

• Description accurately reflects what changes are being made.
• Either the PR references an issue (via the "Development" combobox) or the description explains the need for the changes.
• The PR appropriately sized.
• The PR contains an idempotent DB migration.
• I have verified the correctness of the DB migration using relevant data (e.g. test-generated data).
• New code has enough tests.
• New code has enough documentation to answer "how do I use it?" and "what does it do?".
• Existing documentation is up-to-date, if impacted.

[MissingNO57]

LGTM