test: improve VRT developer experience

[markov00]

Summary

This PR renames yarn jest:integration script to yarn test:integration to align the name to the rest of the test scripts we have.

This PR adds one more script to run the VRT directly against a local storybook server:

yarn test:integration:local

This will reduce the VRTs time removing the build time spent on the storybook build.

I've updated the docs to include the use of --testNamePattern to limit the test on a specific regex instead of the previously implemented env variable in this PR.

[codecov-io]

Codecov Report

Merging #653 into master will increase coverage by 0.17%.
The diff coverage is 81.41%.

@@            Coverage Diff             @@
##           master     #653      +/-   ##
==========================================
+ Coverage   72.74%   72.91%   +0.17%     
==========================================
  Files         264      266       +2     
  Lines        8487     8585      +98     
  Branches     1655     1682      +27     
==========================================
+ Hits         6174     6260      +86     
- Misses       2275     2287      +12     
  Partials       38       38              

Impacted Files	Coverage Δ
src/chart_types/xy_chart/legend/legend.ts	84.61% <ø> (ø)
...ypes/xy_chart/renderer/canvas/annotations/index.ts	30.00% <ø> (ø)
...ypes/xy_chart/renderer/canvas/annotations/lines.ts	25.00% <ø> (ø)
...types/xy_chart/renderer/canvas/annotations/rect.ts	23.52% <ø> (ø)
..._types/xy_chart/renderer/canvas/primitives/rect.ts	5.35% <ø> (ø)
.../chart_types/xy_chart/renderer/canvas/xy_chart.tsx	86.30% <ø> (ø)
src/chart_types/xy_chart/utils/specs.ts	100.00% <ø> (ø)
src/scales/index.ts	100.00% <ø> (ø)
src/components/tooltip/tooltip.tsx	26.66% <26.66%> (ø)
...ypes/xy_chart/renderer/dom/annotation_tooltips.tsx	52.13% <30.76%> (-3.11%)	⬇️
... and 34 more

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[markov00]

🎉 This PR is included in version 19.1.0 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)

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