feat: add extension point for workspace home page

[riahk]

SUMMARY

• Adds registration points for new welcome page views + related UI changes to support these extensions
• Update to ListViewCard: optional subtitle section
• Update to antd radio component to support radio buttons
• Add fields to charts api GET by id: changed_on_delta_humanized, id, thumbnail_url, url
• Add field to saved query api GET by id: changed_on_delta_humanized

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

• Update python integration test (chart api)

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 #21033 (394d62e) into master (394d62e) will not change coverage.
The diff coverage is n/a.

❗ Current head 394d62e differs from pull request most recent head e1a4d11. Consider uploading reports for the commit e1a4d11 to get more accurate results

@@           Coverage Diff           @@
##           master   #21033   +/-   ##
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  Coverage   66.27%   66.27%           
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  Files        1770     1770           
  Lines       67524    67524           
  Branches     7178     7178           
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  Hits        44754    44754           
  Misses      20936    20936           
  Partials     1834     1834           

Flag	Coverage Δ
hive	53.16% <0.00%> (ø)
javascript	52.00% <0.00%> (ø)
mysql	80.95% <0.00%> (ø)
postgres	81.01% <0.00%> (ø)
presto	53.06% <0.00%> (ø)
python	81.49% <0.00%> (ø)
sqlite	79.61% <0.00%> (ø)
unit	50.72% <0.00%> (ø)

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[lilykuang]

LGTM