chore: remove deprecated celery cli

[dpgaspar]

SUMMARY

Removes deprecated celery cli. users should use celery cli itself

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue: [2.0] remove SUPERSET_WORKERS #18902 [2.0] Remove deprecated Celery CLI. #18905
• 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 #19273 (8a3c2dc) into master (dc57508) will increase coverage by 0.03%.
The diff coverage is n/a.

❗ Current head 8a3c2dc differs from pull request most recent head 177a3e9. Consider uploading reports for the commit 177a3e9 to get more accurate results

@@            Coverage Diff             @@
##           master   #19273      +/-   ##
==========================================
+ Coverage   66.54%   66.57%   +0.03%     
==========================================
  Files        1668     1667       -1     
  Lines       64452    64418      -34     
  Branches     6503     6503              
==========================================
- Hits        42888    42886       -2     
+ Misses      19881    19849      -32     
  Partials     1683     1683              

Flag	Coverage Δ
hive	52.69% <ø> (+0.04%)	⬆️
mysql	81.56% <ø> (+0.08%)	⬆️
postgres	81.61% <ø> (+0.08%)	⬆️
presto	52.54% <ø> (+0.04%)	⬆️
python	82.03% <ø> (+0.08%)	⬆️
sqlite	81.37% <ø> (+0.08%)	⬆️

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

Impacted Files	Coverage Δ
superset/config.py	91.74% <ø> (-0.06%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update dc57508...177a3e9. Read the comment docs.

[villebro]

LGTM 🔥 I double checked that we don't have references to the deprecated commands in the docs.