fix: Dashboard API flaky test

[michael-s-molina]

SUMMARY

Uses freezegun to fix a dashboard API flaky test.

TESTING INSTRUCTIONS

1 - Execute all tests
2 - All tests should pass

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

[villebro]

LGTM!

[codecov]

Codecov Report

Merging #17611 (f430826) into master (d7e3a60) will decrease coverage by 0.14%.
The diff coverage is 60.64%.

❗ Current head f430826 differs from pull request most recent head 8ccf618. Consider uploading reports for the commit 8ccf618 to get more accurate results

@@            Coverage Diff             @@
##           master   #17611      +/-   ##
==========================================
- Coverage   68.59%   68.44%   -0.15%     
==========================================
  Files        1588     1601      +13     
  Lines       64948    65258     +310     
  Branches     6963     6963              
==========================================
+ Hits        44548    44664     +116     
- Misses      18510    18704     +194     
  Partials     1890     1890              

Flag	Coverage Δ
hive	?
mysql	81.80% <60.64%> (-0.23%)	⬇️
postgres	81.81% <60.64%> (-0.23%)	⬇️
presto	81.67% <60.64%> (-0.23%)	⬇️
python	82.06% <60.64%> (-0.48%)	⬇️
sqlite	81.49% <60.64%> (-0.22%)	⬇️

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

Impacted Files	Coverage Δ
superset/key_value/api.py	41.46% <41.46%> (ø)
superset/dashboards/filter_state/commands/get.py	50.00% <50.00%> (ø)
superset/key_value/commands/create.py	57.14% <57.14%> (ø)
superset/key_value/commands/get.py	57.14% <57.14%> (ø)
superset/key_value/commands/update.py	57.69% <57.69%> (ø)
superset/key_value/commands/delete.py	60.00% <60.00%> (ø)
...uperset/dashboards/filter_state/commands/create.py	63.63% <63.63%> (ø)
...uperset/dashboards/filter_state/commands/delete.py	63.63% <63.63%> (ø)
...uperset/dashboards/filter_state/commands/update.py	63.63% <63.63%> (ø)
superset/key_value/utils.py	75.00% <75.00%> (ø)
... and 11 more

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