kobotoolbox / kpi / 28639218346

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feat(qualitativeAnalysis): add `QATagTracker` model for QA tag autocomplete DEV-1469 (#7195)

### 📣 Summary
This PR introduces the `QATagTracker` model to support autocomplete
suggestions for QA tag-type questions.


### 📖 Description
This PR adds the `QATagTracker` model to the subsequences app as the
database foundation for the autocomplete-for-QA-tag-questions feature.
Each row represents a unique tag value used for a specific QA question
on a specific asset.

The model includes a foreign key to `Asset`, a `question_uuid` field
identifying the QA question (stored as a plain char field since QA
questions are not persisted as database objects), and a value field
holding the tag string. A unique constraint on (asset, question_uuid,
value) ensures no duplicate tags are stored per question.

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