chore(explore): migrate enzyme to RTL

[justinpark]

SUMMARY

This commit migrates enzyme testing codes by react testing-library for src/explore/components

TESTING INSTRUCTIONS

npm run test

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 (578a899) 69.18% compared to head (916aeb1) 69.23%.
Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #26272      +/-   ##
==========================================
+ Coverage   69.18%   69.23%   +0.04%     
==========================================
  Files        1945     1946       +1     
  Lines       75948    75968      +20     
  Branches     8460     8469       +9     
==========================================
+ Hits        52545    52595      +50     
+ Misses      21218    21183      -35     
- Partials     2185     2190       +5     

Flag	Coverage Δ
javascript	56.61% <ø> (+0.09%)	⬆️

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