### What changes were proposed in this pull request?
Define baseLegend variable for jvm grafana dashboard.
BTW, refactor the `"legendFormat": "$baseLegend"` to `"legendFormat": "${baseLegend}"` in celeborn metrics dashboard json.
### Why are the changes needed?
so that customer can change the legend variable case by case.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Local Test.
Closes #2038 from turboFei/jvm_legend.
Authored-by: fwang12 <fwang12@ebay.com>
Signed-off-by: zky.zhoukeyong <zky.zhoukeyong@alibaba-inc.com>
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