chore: always get dashboard_id on dashboard API get endpoint

[lilykuang]

SUMMARY

• this endpoint logger slug or id, here we tried to make it always log id

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 #20894 (8623999) into master (e4fc556) will decrease coverage by 0.10%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master   #20894      +/-   ##
==========================================
- Coverage   66.37%   66.27%   -0.11%     
==========================================
  Files        1767     1758       -9     
  Lines       67230    67190      -40     
  Branches     7137     7122      -15     
==========================================
- Hits        44625    44530      -95     
- Misses      20779    20841      +62     
+ Partials     1826     1819       -7     

Flag	Coverage Δ
hive	53.20% <66.66%> (-0.01%)	⬇️
mysql	81.02% <100.00%> (+<0.01%)	⬆️
postgres	?
presto	53.09% <66.66%> (-0.01%)	⬇️
python	81.49% <100.00%> (-0.08%)	⬇️
sqlite	79.67% <100.00%> (+<0.01%)	⬆️
unit	50.52% <66.66%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
superset/dashboards/api.py	92.50% <100.00%> (+0.02%)	⬆️
...t-frontend/src/components/DropdownButton/index.tsx	10.00% <0.00%> (-75.00%)	⬇️
superset/sql_validators/postgres.py	50.00% <0.00%> (-50.00%)	⬇️
superset-frontend/src/featureFlags.ts	66.66% <0.00%> (-33.34%)	⬇️
superset/sql_validators/__init__.py	80.00% <0.00%> (-20.00%)	⬇️
superset-frontend/src/components/Select/Select.tsx	67.78% <0.00%> (-19.30%)	⬇️
...frontend/src/SqlLab/components/SaveQuery/index.tsx	57.89% <0.00%> (-16.47%)	⬇️
...d/src/SqlLab/components/SaveDatasetModal/index.tsx	35.29% <0.00%> (-14.71%)	⬇️
superset/db_engine_specs/postgres.py	90.67% <0.00%> (-5.94%)	⬇️
superset-frontend/src/utils/urlUtils.ts	46.80% <0.00%> (-4.11%)	⬇️
... and 52 more

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