chore(dashboard): migrate enzyme to RTL

[justinpark]

SUMMARY

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

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 (2cd7135) 67.17% compared to head (1b5c36c) 67.16%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #26260      +/-   ##
==========================================
- Coverage   67.17%   67.16%   -0.01%     
==========================================
  Files        1899     1899              
  Lines       74354    74354              
  Branches     8266     8266              
==========================================
- Hits        49945    49939       -6     
- Misses      22360    22362       +2     
- Partials     2049     2053       +4     

Flag	Coverage Δ
javascript	56.90% <100.00%> (-0.02%)	⬇️

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[rusackas]

LGTM (and LGTGPT)