chore: Renaming Line Chart to Line Chart v2

[lauderbaugh]

SUMMARY

If you have generic x-axis on, there are two charts called "Line Chart." This is confusing and incorrect since they are different charts. This update creates a naming distinction by updating the e-charts version to be "Line Chart v2."

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

n/a

TESTING INSTRUCTIONS

• Turn on the feature flag
• Go to the visualization picker
• Observe that the label now contains the 'v2' indicator

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags: GENERIC_CHART_AXES
• 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 #21278 (24b1f88) into master (a7fe485) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #21278   +/-   ##
=======================================
  Coverage   66.42%   66.42%           
=======================================
  Files        1784     1784           
  Lines       68236    68236           
  Branches     7265     7265           
=======================================
  Hits        45327    45327           
  Misses      21040    21040           
  Partials     1869     1869           

Flag	Coverage Δ
javascript	52.49% <ø> (ø)

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

Impacted Files	Coverage Δ
...chart-echarts/src/Timeseries/Regular/Line/index.ts	33.33% <ø> (ø)

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[stephenLYZ]

LGTM!