fix: remove feature flag for tags on Dashboard API for Tags

[hughhhh]

SUMMARY

Dashboard Tags don't appear on Dashboard CRUD View for superset, here's a PR to allow the columns to be exposed but the client will manage whether they appear

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 #23909 (be37c6b) into master (a8e02cd) will decrease coverage by 0.13%.
The diff coverage is n/a.

❗ Current head be37c6b differs from pull request most recent head 383482b. Consider uploading reports for the commit 383482b to get more accurate results

@@            Coverage Diff             @@
##           master   #23909      +/-   ##
==========================================
- Coverage   68.08%   67.95%   -0.13%     
==========================================
  Files        1939     1939              
  Lines       75012    75008       -4     
  Branches     8154     8154              
==========================================
- Hits        51072    50974      -98     
- Misses      21857    21951      +94     
  Partials     2083     2083              

Flag	Coverage Δ
hive	?
mysql	78.81% <ø> (?)
postgres	78.88% <ø> (+<0.01%)	⬆️
presto	?
python	82.37% <ø> (-0.27%)	⬇️
sqlite	77.40% <ø> (+<0.01%)	⬆️
unit	52.82% <ø> (+<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	92.54% <ø> (+0.43%)	⬆️

... and 11 files with indirect coverage changes

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