UI: Fix task instance state badge staying stale after Mark-as action

[GayathriSrividya]

closes: #67883

After marking a task instance as success/failed/skipped, the state badge
on the task instance detail page does not update until a manual page reload.

The root cause is in usePatchTaskInstance: the GetMappedTaskInstance
query was invalidated using the full 4-field key
UseTaskInstanceServiceGetMappedTaskInstanceKeyFn({ dagId, dagRunId, mapIndex, taskId }).
While this exact key should theoretically match, TanStack Query's
partialDeepEqual matching is more reliable when the search key is a
subset of the cached key rather than an exact match.

usePatchDagRun already uses the partial-key pattern for the same query:

[useTaskInstanceServiceGetMappedTaskInstanceKey, { dagId, dagRunId }]

This PR aligns usePatchTaskInstance to the same approach, using
[useTaskInstanceServiceGetMappedTaskInstanceKey, { dagId, dagRunId, taskId }]
as a partial key that matches any mapIndex for the given task. This also
eliminates the separate predicate-based invalidation that was needed for the
"patch all mapped TIs" case (mapIndex === undefined), simplifying the code.