UI: Add a column in asset store display table linking to the TI that wrote it

[amoghrajesh]

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Was generative AI tooling used to co-author this PR?

• Yes: claude sonnet

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What

The Asset Store table had no visibility into what wrote each entry. When a task updates an asset store value via the execution API, there was no way to trace which task instance was responsible from the UI.

Current behaviour

The Asset Store table shows key, value, and updated-at timestamp but no information about what wrote the entry.

Proposed change

Adds a "Last Updated By" column to the Asset Store table. When an entry was written by a task, it renders the task ID as a clickable link to the task instance page (/dags/{dag_id}/runs/{run_id}/tasks/{task_id}) with the Dag ID shown as a muted subtitle. Mapped task instances link to the mapped variant path. API and watcher writes show plain "API" or "Watcher" text.

Changes of Note

The AssetStoreWriterKind enum values in the OpenAPI-generated types are lowercase ('task' | 'watcher' | 'api'), matching what the API returns. Comparisons must use lowercase string literals accordingly.

Some screenshots

Clicking on the link leads to TI logs page

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