fix: Duplicated plugin registration

[michael-s-molina]

SUMMARY

This PR removes the duplicated plugin registration that generates the following type of warning:

Item with key "deck_arc" already exists. You are assigning a new value.
Item with key "deck_arc" already exists. You are assigning a new value.
Item with key "big_number" already exists. You are assigning a new value.
Item with key "box_plot" already exists. You are assigning a new value.

The duplicate registration was necessary when those pages belonged to different React apps. Now, they belong to the same app which makes the registration unnecessary.

The registration should happen only once when the application initializes.

TESTING INSTRUCTIONS

1 - Open any dashboard
2 - Check that the warnings are not there anymore

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

All modified and coverable lines are covered by tests ✅

Comparison is base (863f8bb) 69.18% compared to head (dc37653) 69.14%.
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #26379      +/-   ##
==========================================
- Coverage   69.18%   69.14%   -0.04%     
==========================================
  Files        1946     1946              
  Lines       75988    75986       -2     
  Branches     8479     8479              
==========================================
- Hits        52570    52541      -29     
- Misses      21228    21266      +38     
+ Partials     2190     2179      -11     

Flag	Coverage Δ
javascript	56.46% <ø> (-0.08%)	⬇️

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