fix: sync generated slow query client artifacts after #1900

[yibin87]

Follow-up to #1900.

Summary:
PR #1900 added the session_connect_attrs field to the backend slow query model, but the generated frontend client artifacts were not synced.

This PR updates the generated files that should reflect that field:

• ui/packages/tidb-dashboard-client/swagger/spec.json
• ui/packages/tidb-dashboard-client/src/client/api/models/slowquery-model.ts
• ui/packages/tidb-dashboard-lib/src/client/models.ts

Validation:

• Re-ran scripts/generate_swagger_spec.sh and confirmed ui/packages/tidb-dashboard-client/swagger/spec.json was stale and needed session_connect_attrs.
• Full frontend OpenAPI regeneration could not be executed in this environment because openapi-generator-cli requires a local Java runtime, which is not installed here.
• Synced the affected generated TS model outputs to match the regenerated spec.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign baurine for approval. For more information see the Code Review Process.
Please ensure that each of them provides their approval before proceeding.

The full list of commands accepted by this bot can be found here.

Details

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment