fix: Faulty datetime parser regex

[reesercollins]

SUMMARY

As it currently stands, the regex for the datetime parser will incorrectly recognize things like "todayblahblah" and "snow" as datetime constants.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

Try running "snow" through the dateTime parser before the changes. It should give erroneous results. After this change, it should behave as expected.

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 #20290 (c2b861d) into master (77e326f) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head c2b861d differs from pull request most recent head 8af4cf3. Consider uploading reports for the commit 8af4cf3 to get more accurate results

@@           Coverage Diff           @@
##           master   #20290   +/-   ##
=======================================
  Coverage   66.65%   66.65%           
=======================================
  Files        1729     1729           
  Lines       64904    64906    +2     
  Branches     6842     6842           
=======================================
+ Hits        43262    43266    +4     
+ Misses      19893    19891    -2     
  Partials     1749     1749           

Flag	Coverage Δ
javascript	51.57% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
...nts/controls/DateFilterControl/utils/dateParser.ts	92.30% <100.00%> (ø)
...uperset-frontend/src/explore/exploreUtils/index.js	80.59% <100.00%> (+0.88%)	⬆️
...perset-frontend/src/views/CRUD/alert/AlertList.tsx	65.65% <100.00%> (+0.35%)	⬆️
superset/reports/api.py	90.22% <100.00%> (+0.38%)	⬆️
superset/utils/csv.py	97.91% <100.00%> (ø)

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[zhaoyongjie]

@reesercollins do you mind giving me an example of this? the error input, for example, the snow/todayblabla. the backend should return a parse exception.

[reesercollins]

This may just be our organization's changes to the dateparser which added a third option to the datetimeConstant regex which meant now would be parsed anywhere in the string, including in the string DATEADD(DATETIME("now"), -7, day). Either way, by making this fix, it prevents further errors down the line should more datetime constants be added upstream.

[zhaoyongjie]

@reesercollins make sense. the change is safe, and approved! Thanks!