feat(dashboard): Add create chart button in dashboard edit mode

[kgabryje]

SUMMARY

Clicking on "Create new chart" in "Charts" tab in dashboard edit mode button redirects to /chart/add view in a new tab.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

1. Go to dashboard edit mode -> Charts tab
2. Click "Create new chart" button
3. Verify that you've were redirected to /chart/add page

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

CC @kasiazjc

[codecov]

Codecov Report

Merging #20126 (de2ed22) into master (660af40) will decrease coverage by 0.00%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master   #20126      +/-   ##
==========================================
- Coverage   66.47%   66.46%   -0.01%     
==========================================
  Files        1721     1721              
  Lines       64477    64483       +6     
  Branches     6795     6795              
==========================================
+ Hits        42858    42860       +2     
- Misses      19891    19895       +4     
  Partials     1728     1728              

Flag	Coverage Δ
javascript	51.35% <33.33%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
...t-frontend/src/dashboard/components/SliceAdder.jsx	66.17% <33.33%> (-3.18%)	⬇️

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[villebro]

LGTM

[villebro]

It could be interesting to implement broadcasting so that the list is updated when a chart is created: https://developer.mozilla.org/en-US/docs/Web/API/Broadcast_Channel_API

[kgabryje]

Good idea! But wouldn't we actually need to use websocket instead to update the list when chart is saved on the backend? I just wonder if such frontend communication would be reliable enough