fix(cpq): Add schema to Query.data() payload

[hughhhh]

SUMMARY

Whenever in explore datasource object always has a schema = null. Now updating the Query.data payload with schema, when converting a Query into Dataset (SqlaTable) schema is registered properly.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

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 #22791 (31aa28c) into master (1fe4a71) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #22791   +/-   ##
=======================================
  Coverage   67.28%   67.28%           
=======================================
  Files        1877     1877           
  Lines       72002    72002           
  Branches     7893     7893           
=======================================
  Hits        48444    48444           
  Misses      21530    21530           
  Partials     2028     2028           

Flag	Coverage Δ
hive	52.60% <ø> (ø)
javascript	53.85% <ø> (ø)
mysql	78.57% <ø> (ø)
postgres	78.64% <ø> (ø)
presto	52.49% <ø> (ø)
python	81.88% <ø> (ø)
sqlite	77.00% <ø> (ø)
unit	51.54% <ø> (ø)

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Impacted Files	Coverage Δ
superset/models/sql_lab.py	74.80% <ø> (ø)

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