fix: deactivate embedding on a dashboard

[suddjian]

SUMMARY

Deletion wasn't getting committed properly. The DAO method calls commit(), so switched to that.

TESTING INSTRUCTIONS

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 #19626 (47f6b81) into master (6136942) will decrease coverage by 12.80%.
The diff coverage is 50.81%.

❗ Current head 47f6b81 differs from pull request most recent head 07c9678. Consider uploading reports for the commit 07c9678 to get more accurate results

@@             Coverage Diff             @@
##           master   #19626       +/-   ##
===========================================
- Coverage   66.65%   53.85%   -12.81%     
===========================================
  Files        1680     1681        +1     
  Lines       64277    64371       +94     
  Branches     6564     6583       +19     
===========================================
- Hits        42844    34665     -8179     
- Misses      19731    28025     +8294     
+ Partials     1702     1681       -21     

Flag	Coverage Δ
hive	52.66% <64.91%> (-0.04%)	⬇️
mysql	?
postgres	?
presto	52.51% <64.91%> (-0.04%)	⬇️
python	56.63% <78.94%> (-25.76%)	⬇️
sqlite	?
unit	47.71% <50.87%> (+0.49%)	⬆️

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

Impacted Files	Coverage Δ
...ugins/legacy-plugin-chart-chord/src/ReactChord.jsx	0.00% <0.00%> (ø)
...s/legacy-plugin-chart-horizon/src/HorizonChart.jsx	0.00% <0.00%> (ø)
...acy-plugin-chart-paired-t-test/src/PairedTTest.jsx	0.00% <0.00%> (ø)
...rt-parallel-coordinates/src/ParallelCoordinates.js	0.00% <ø> (ø)
...allel-coordinates/src/ReactParallelCoordinates.jsx	0.00% <0.00%> (ø)
...ins/legacy-plugin-chart-partition/src/Partition.js	0.00% <ø> (ø)
...gacy-plugin-chart-partition/src/ReactPartition.jsx	0.00% <0.00%> (ø)
...ins/legacy-plugin-chart-sankey/src/ReactSankey.jsx	0.00% <0.00%> (ø)
...lugin-chart-echarts/src/Timeseries/transformers.ts	51.23% <ø> (ø)
...ontend/src/SqlLab/components/QuerySearch/index.tsx	73.07% <ø> (ø)
... and 321 more

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