feat(bullet): migrate bullet chart to v1 chart data API

[rusackas]

SUMMARY

Tier 1 of #41714 (targets remove-legacy-viz-pipeline): migrate the nvd3 Bullet Chart (bullet) off explore_json onto /api/v1/chart/data.

• New Bullet/buildQuery.ts mirroring the legacy BulletViz.query_obj: a single ungrouped metric.
• The {measures: [...]} reshape viz.py did server-side now happens in the Bullet branch of the shared nvd3 transformProps (legacy-shaped payloads pass through untouched; other nvd3 charts unaffected).
• useLegacyApi: true removed (and the "Legacy" tag dropped).
• No DB migration: viz_type unchanged; legacy granularity_sqla/time_range handled by extractExtras (covered by test).

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

No visual change — same renderer, same data shape, different endpoint.

TESTING INSTRUCTIONS

• npm run test -- plugins/legacy-preset-chart-nvd3 — 5 new Jest tests (buildQuery shape, granularity_sqla mapping, v1 records→measures reshape incl. adhoc metric labels, legacy payload pass-through); 37 total pass.
• Manual: open a saved Bullet chart; network tab shows POST /api/v1/chart/data; rendering identical.

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
• Introduces new feature or API
• Removes existing feature or API

🤖 Generated with Claude Code

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[codecov]

Codecov Report

❌ Patch coverage is 71.42857% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.64%. Comparing base (c6242a6) to head (71f153e).

Files with missing lines	Patch %	Lines
...ins/legacy-preset-chart-nvd3/src/transformProps.ts	66.66%	3 Missing ⚠️
...ugins/legacy-preset-chart-nvd3/src/Bullet/index.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@                      Coverage Diff                       @@
##           remove-legacy-viz-pipeline   #41718      +/-   ##
==============================================================
+ Coverage                       64.62%   64.64%   +0.01%     
==============================================================
  Files                            2684     2685       +1     
  Lines                          148431   148440       +9     
  Branches                        34249    34252       +3     
==============================================================
+ Hits                            95930    95956      +26     
+ Misses                          50739    50722      -17     
  Partials                         1762     1762              

Flag	Coverage Δ
javascript	69.42% <71.42%> (+0.02%)	⬆️

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