fix: pivot v2 charts created before GENERIC_CHART_AXES is enabled

[betodealmeida]

SUMMARY

Pivot v2 charts lose their time granularity when GENERIC_CHART_AXES is enabled, see screenshots.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Before, a dashboard showing two pivot charts with monthly time grain, with GENERIC_CHART_AXES enabled. The one on the left was created before GENERIC_CHART_AXES was enabled, and the one on the right was created after. Note that the left chart has multiple values for January, which shouldn't happen:

After:

TESTING INSTRUCTIONS

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

[codecov]

Codecov Report

Merging #23731 (2122bd4) into master (e8121b1) will increase coverage by 0.00%.
The diff coverage is n/a.

❗ Current head 2122bd4 differs from pull request most recent head 19bff5f. Consider uploading reports for the commit 19bff5f to get more accurate results

@@           Coverage Diff           @@
##           master   #23731   +/-   ##
=======================================
  Coverage   68.02%   68.02%           
=======================================
  Files        1936     1936           
  Lines       74929    74929           
  Branches     8141     8141           
=======================================
+ Hits        50970    50974    +4     
+ Misses      21871    21870    -1     
+ Partials     2088     2085    -3     

Flag	Coverage Δ
javascript	54.29% <ø> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
.../plugin-chart-pivot-table/src/plugin/buildQuery.ts	71.42% <ø> (+28.57%)	⬆️

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