<!-- Add the related story/sub-task/bug number, like Resolves#123, or
remove if NA -->
**Related issue:** Resolves#35724
This PR addresses Issue 3 in the above unreleased bug: when a new
`software` comes in, its `upgrade_code` is compared with that of any
corresponding `software_title`s, and reconciled appropriately - see code
for the various cases
## Testing
- [x] Added/updated automated tests
- [x] QA'd all new/changed functionality manually
- [x] Load tests: @AndreyKizimenko since I don't think you've load
tested the original story yet, this change will be covered by those
tests when you do
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Bug Fixes**
* Ensured upgrade_code values on existing software titles are
consistently updated when incoming data provides non-empty values; added
logging and safe retry handling for anomalous states.
* **Tests**
* Added table-driven tests covering upgrade_code reconciliation
scenarios (empty, non-empty, conflicting, NULL) and verification of
resulting title values.
* **Refactor**
* Introduced a lightweight software title summary type and updated
internal mappings to streamline pre-insert and reconciliation
processing.
<sub>✏️ Tip: You can customize this high-level summary in your review
settings.</sub>
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
