fix(echart): Tooltip date format doesn't follow time grain

[justinpark]

SUMMARY

This commit modifies the incorrect tooltip data transformation format function to use the same format function applied in the existing nvd3, ensuring that the tooltip date display is consistently transformed according to the time grain.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Time Grain	NVD3	Before	After
Month
Week
Hour

TESTING INSTRUCTIONS

Select a line chart and choose a time column as x-axis
Select different time grain and see the tooltip's description

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[korbit-ai]

I've completed my review and didn't find any issues.

Files scanned

​

File Path	Reviewed
superset-frontend/plugins/plugin-chart-echarts/src/utils/formatters.ts	✅

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