fix: dashboard ownership check

[betodealmeida]

SUMMARY

Fix dashboard ownership check. There's currently a bug where non-admin users can't edit a dashboard (even a new one) because username was removed from the API response payload in #24056, making this check fail:

superset/superset-frontend/src/dashboard/util/permissionUtils.ts

Line 45 in 674da1b

dashboard.owners.some(owner => owner.username === user.username);

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

N/A

TESTING INSTRUCTIONS

I'm adding the tests in a separate PR, so we can cherry-pick this quickly.

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 #24249 (659b098) into master (674da1b) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 659b098 differs from pull request most recent head 78437f8. Consider uploading reports for the commit 78437f8 to get more accurate results

@@           Coverage Diff           @@
##           master   #24249   +/-   ##
=======================================
  Coverage   68.30%   68.30%           
=======================================
  Files        1957     1957           
  Lines       75596    75596           
  Branches     8222     8222           
=======================================
  Hits        51639    51639           
  Misses      21849    21849           
  Partials     2108     2108           

Flag	Coverage Δ
javascript	54.72% <100.00%> (ø)

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

Impacted Files	Coverage Δ
...set-frontend/src/dashboard/util/permissionUtils.ts	86.66% <100.00%> (ø)

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[betodealmeida]

cc: @eschutho