Fix trace polling todo

[Myself-Praveen]

Which problem is this PR solving?

• Resolves a hidden TODO left in packages/jaeger-ui/src/hooks/useTraceLoading.ts. Currently, staleTime: Infinity is used for caching traces, which is incorrect since Jaeger may return partial traces while spans are still arriving.

Description of the changes

• Changed staleTime from Infinity to 60_000 (60 seconds).
• Added meta.firstFetchedAt to stamp the query creation time.
• Implemented a refetchInterval function that calculates the elapsed time since firstFetchedAt.
• The hook now correctly polls for partial trace updates every 60 seconds for up to 5 minutes, gracefully falling back to false when the time window expires.

How was this change tested?

• Verified that the trace data is cached correctly.
• Confirmed that existing automated tests for useTraceLoading pass successfully locally.

Checklist

• I have read https://github.com/jaegertracing/jaeger/blob/main/CONTRIBUTING_GUIDELINES.md
• I have signed all commits
• I have added unit tests for the new functionality
• I have run lint and test steps successfully: make lint test

AI Usage in this PR (choose one)

See AI Usage Policy.

• None: No AI tools were used in creating this PR
• Light: AI provided minor assistance (formatting, simple suggestions)
• Moderate: AI helped with code generation or debugging specific parts
• Heavy: AI generated most or all of the code changes

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