fix(imports): import query_context for imports with charts

[lindenh]

SUMMARY

Previously, the query_context was removed on imports because of the necessary changes to datasource table ids on import to align with already-existing datasources even if the id itself was different (as it may be across environments).
This became a problem in #28446 as the query context was now required for embedded charts.

This normally isn't an issue, as the query context is generated when saving the chart on the frontend, but if charts are uploaded, this context is removed. This re-adds that imported context with the same changes made to the query_context as made to the imported charts themselves to ensure they point at the right data source.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue: 4.0 - Imported charts shows error on embedding #28446
• 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

[lindenh]

Think you could give this a pat down @betodealmeida ?

[codecov]

Codecov Report

Attention: Patch coverage is 85.18519% with 4 lines in your changes missing coverage. Please review.

Project coverage is 83.91%. Comparing base (76d897e) to head (164fd3c).
Report is 974 commits behind head on master.

Files with missing lines	Patch %	Lines
superset/commands/utils.py	80.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #30887       +/-   ##
===========================================
+ Coverage   60.48%   83.91%   +23.42%     
===========================================
  Files        1931      536     -1395     
  Lines       76236    38936    -37300     
  Branches     8568        0     -8568     
===========================================
- Hits        46114    32674    -13440     
+ Misses      28017     6262    -21755     
+ Partials     2105        0     -2105     

Flag	Coverage Δ
hive	48.85% <22.22%> (-0.31%)	⬇️
javascript	?
mysql	76.78% <85.18%> (?)
postgres	76.87% <85.18%> (?)
presto	53.34% <22.22%> (-0.47%)	⬇️
python	83.91% <85.18%> (+20.42%)	⬆️
sqlite	76.33% <85.18%> (?)
unit	60.87% <44.44%> (+3.25%)	⬆️

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