chore: Remove StyledQueryButton.less

[geido]

SUMMARY

Removes the StyledQueryButton less file from the StyledQueryButton component.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

No visual changes

TESTING INSTRUCTIONS

1. Follow instructions on https://superset.apache.org/docs/installation/alerts-reports/#schedule-reports
2. Click on Schedule Query in SQL lab
3. Make sure there are no visual changes

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

Merging #19441 (3b76160) into master (fa35109) will decrease coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master   #19441      +/-   ##
==========================================
- Coverage   66.59%   66.55%   -0.05%     
==========================================
  Files        1670     1673       +3     
  Lines       63888    64060     +172     
  Branches     6510     6537      +27     
==========================================
+ Hits        42544    42632      +88     
- Misses      19654    19729      +75     
- Partials     1690     1699       +9     

Flag	Coverage Δ
javascript	51.33% <100.00%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
...rc/SqlLab/components/ScheduleQueryButton/index.tsx	20.75% <100.00%> (+1.52%)	⬆️
.../components/ExploreAdditionalActionsMenu/index.jsx	57.14% <0.00%> (-38.32%)	⬇️
...set-frontend/src/components/ReportModal/styles.tsx	87.50% <0.00%> (-12.50%)	⬇️
.../components/Header/HeaderActionsDropdown/index.jsx	67.79% <0.00%> (-3.64%)	⬇️
...rset-frontend/src/components/ReportModal/index.tsx	78.46% <0.00%> (-3.63%)	⬇️
...d/components/DashboardBuilder/DashboardBuilder.tsx	70.88% <0.00%> (-1.85%)	⬇️
...d/src/SqlLab/components/AceEditorWrapper/index.tsx	43.85% <0.00%> (-0.97%)	⬇️
...rontend/src/dashboard/components/DashboardGrid.jsx	62.50% <0.00%> (-0.55%)	⬇️
...frontend/src/dashboard/components/Header/index.jsx	60.92% <0.00%> (-0.46%)	⬇️
superset-frontend/src/preamble.ts	0.00% <0.00%> (ø)
... and 27 more

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[michael-s-molina]

LGTM