Fix CopyIcon to receive ReactNode instead of string

[anshgoyalevil]

Which problem is this PR solving?

• fixes [Bug]: CopyIcon is not visible on SpanDetail Card #1790

Description of the changes

• Since ant-design v4 doesn't support Icon Names passed to the Button Prop as a string. Instead, it needs a React Node to be passed.

How was this change tested?

• yarn test

New Behavior:

Previous Behavior:

Checklist

• I have read https://github.com/jaegertracing/jaeger/blob/master/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
  • for jaeger: make lint test
  • for jaeger-ui: yarn lint and yarn test

[codecov]

Codecov Report

Patch has no changes to coverable lines.

Files Changed	Coverage
.../TraceTimelineViewer/SpanDetail/KeyValuesTable.tsx	ø
...TracePage/TraceTimelineViewer/SpanDetail/index.tsx	ø
...kages/jaeger-ui/src/components/common/CopyIcon.tsx	ø

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