fix(embedded): Ensure guest token is passed to log endpoint

[jfrag1]

SUMMARY

Currently when using embedding a dashboard, calls to the /log/ endpoint return a 401 response. This is because navigator.sendBeacon was not sending the guest token used for authentication in the way that SupersetClient does.

This PR will ensure the guest token is included so that event logging works for embedded dashboards.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

N/A

TESTING INSTRUCTIONS

1. Embed a dashboard
2. Perform actions that trigger calls to /log/
3. See that these calls succeed with a 200 response

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 #20647 (2bc4942) into master (e1a918f) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master   #20647   +/-   ##
=======================================
  Coverage   66.81%   66.81%           
=======================================
  Files        1753     1753           
  Lines       65806    65810    +4     
  Branches     7001     7001           
=======================================
+ Hits        43966    43973    +7     
+ Misses      20056    20053    -3     
  Partials     1784     1784           

Flag	Coverage Δ
javascript	51.96% <100.00%> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
.../superset-ui-core/src/connection/SupersetClient.ts	100.00% <100.00%> (ø)
...rset-ui-core/src/connection/SupersetClientClass.ts	100.00% <100.00%> (ø)
...perset-frontend/src/middleware/loggerMiddleware.js	78.04% <100.00%> (+8.81%)	⬆️

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