fix(dashboard): scrolling table viz overlaps next chart

[diegomedina248]

SUMMARY

Ensures the dashboard charts properly calculate their header on first render, by computing the description height if it's initially visible.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Before:
https://user-images.githubusercontent.com/17252075/157877685-61324b4a-42fb-40a5-8cca-fa9ea9db5740.mov

After:
https://user-images.githubusercontent.com/17252075/157877901-39c98523-6636-45a5-9a3e-883d4bb43d15.mov

TESTING INSTRUCTIONS

See the issue for reproduction steps

ADDITIONAL INFORMATION

• Has associated issue: [dashboard] Scrolling table viz overlaps next chart #18223
• 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 #19121 (522356e) into master (a37a4ed) will decrease coverage by 0.00%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master   #19121      +/-   ##
==========================================
- Coverage   66.51%   66.51%   -0.01%     
==========================================
  Files        1645     1646       +1     
  Lines       63515    63536      +21     
  Branches     6464     6467       +3     
==========================================
+ Hits        42250    42263      +13     
- Misses      19593    19597       +4     
- Partials     1672     1676       +4     

Flag	Coverage Δ
javascript	51.28% <85.71%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
.../src/dashboard/components/gridComponents/Chart.jsx	60.20% <85.71%> (+2.59%)	⬆️
...ponents/controls/VizTypeControl/VizTypeGallery.tsx	87.56% <0.00%> (-3.61%)	⬇️
...frontend/src/components/TimezoneSelector/index.tsx	96.96% <0.00%> (-0.09%)	⬇️
...superset-ui-core/src/chart/models/ChartMetadata.ts	100.00% <0.00%> (ø)
...d/components/DashboardBuilder/DashboardBuilder.tsx	72.72% <0.00%> (ø)
.../packages/superset-ui-core/src/chart/types/Base.ts	100.00% <0.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update a37a4ed...522356e. Read the comment docs.

[rusackas]

LGTM! Thanks!