refactor: migrate to icons for searchinput icons

[pkdotson]

SUMMARY

This pr migrates the old icon to icons for the search and cancel x component in the listview.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

before

after

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• 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 #15533 (e3e60c2) into master (ee2ee48) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head e3e60c2 differs from pull request most recent head 2ae03c5. Consider uploading reports for the commit 2ae03c5 to get more accurate results

@@            Coverage Diff             @@
##           master   #15533      +/-   ##
==========================================
- Coverage   76.97%   76.96%   -0.01%     
==========================================
  Files         976      976              
  Lines       51260    51266       +6     
  Branches     6900     6901       +1     
==========================================
+ Hits        39456    39458       +2     
- Misses      11585    11589       +4     
  Partials      219      219              

Flag	Coverage Δ
javascript	71.37% <100.00%> (-0.02%)	⬇️

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

Impacted Files	Coverage Δ
.../database/DatabaseModal/DatabaseConnectionForm.tsx	63.09% <ø> (ø)
...s/CRUD/data/database/DatabaseModal/ModalHeader.tsx	91.66% <ø> (ø)
...end/src/components/Form/LabeledErrorBoundInput.tsx	100.00% <100.00%> (ø)
...rset-frontend/src/components/InfoTooltip/index.tsx	100.00% <100.00%> (ø)
...-frontend/src/components/PopoverDropdown/index.tsx	100.00% <100.00%> (ø)
...rset-frontend/src/components/SearchInput/index.tsx	100.00% <100.00%> (ø)
...c/views/CRUD/data/database/DatabaseModal/index.tsx	47.86% <100.00%> (ø)
...c/views/CRUD/data/database/DatabaseModal/styles.ts	82.72% <100.00%> (-3.39%)	⬇️
superset/connectors/sqla/models.py	89.89% <100.00%> (+0.02%)	⬆️

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[geido]

/testenv up

[github-actions]

@geido Ephemeral environment spinning up at http://52.37.198.57:8080. Credentials are admin/admin. Please allow several minutes for bootstrapping and startup.

[geido]

LGTM!

[github-actions]

Ephemeral environment shutdown and build artifacts deleted.