fix: Don't apply number formatting to the label in Treemap

[kgabryje]

SUMMARY

In Echarts Treemap, the value formatter (number and currency) was unnecessarily applied to labels when labels were numeric. That was both incorrect and inconsistent with other charts.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Before:

After:

TESTING INSTRUCTIONS

1. Create a Treemap chart
2. Use a numeric column as a dimension
3. Verify that only the metric value gets formatter and the label stays unformatted

ADDITIONAL INFORMATION

• Has associated issue: fix: Currency formatting in Table raw mode #25248
• 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

[michael-s-molina]

LGTM. Thanks @kgabryje!