feat: deprecate old API and create new API for dashes created by me

[dpgaspar]

SUMMARY

Following plan to gradually deprecate "REST" endpoints on /superset namespace.

Deprecates /superset/created_dashboards/<int:user_id>/. Proposed removal on Superset 3.0
Replaced by an existing endpoint /api/v1/dashboard/, includes the necessary frontend migration.

TESTING INSTRUCTIONS

Navigate to the user profile and assert that created dashboards renders correctly

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 #19434 (c2d85a4) into master (1cd8b41) will decrease coverage by 0.07%.
The diff coverage is 84.74%.

❗ Current head c2d85a4 differs from pull request most recent head 0a454e3. Consider uploading reports for the commit 0a454e3 to get more accurate results

@@            Coverage Diff             @@
##           master   #19434      +/-   ##
==========================================
- Coverage   66.66%   66.58%   -0.08%     
==========================================
  Files        1678     1680       +2     
  Lines       64261    64293      +32     
  Branches     6561     6564       +3     
==========================================
- Hits        42837    42812      -25     
- Misses      19723    19779      +56     
- Partials     1701     1702       +1     

Flag	Coverage Δ
hive	52.67% <67.85%> (-0.04%)	⬇️
mysql	81.89% <85.71%> (-0.02%)	⬇️
postgres	?
presto	52.52% <67.85%> (-0.04%)	⬇️
python	82.23% <85.71%> (-0.16%)	⬇️
sqlite	?
unit	47.23% <48.21%> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
...-chart-deckgl/src/layers/Screengrid/Screengrid.jsx	0.00% <ø> (ø)
...rontend/src/SqlLab/components/QueryTable/index.tsx	68.96% <ø> (ø)
...rontend/src/visualizations/TimeTable/TimeTable.jsx	0.00% <ø> (ø)
superset/constants.py	100.00% <ø> (ø)
superset/db_engine_specs/__init__.py	84.61% <ø> (-3.85%)	⬇️
superset/connectors/sqla/utils.py	85.71% <42.85%> (-8.86%)	⬇️
superset/migrations/shared/utils.py	75.55% <42.85%> (-6.50%)	⬇️
...frontend/src/profile/components/CreatedContent.tsx	71.42% <50.00%> (ø)
...end/src/components/Datasource/DatasourceEditor.jsx	69.36% <100.00%> (ø)
superset/connectors/sqla/models.py	89.45% <100.00%> (+0.14%)	⬆️
... and 38 more

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[villebro]

One small nit, waiting to rereview once the refactor proposed by @eschutho has been done.