refactor(e2e): model dashboard filter bar

[sadpandajoe]

SUMMARY

Follow up on #42013 by bringing the remaining Clear All regression flow into the Playwright page-object/component model:

• add a DashboardFilterBar component that composes the existing Button and Select primitives and owns the native-filter selectors/actions
• have DashboardPage compose and expose the filter bar while preserving its existing applyFiltersIfEnabled API
• keep clear-all-filters.spec.ts focused on scenario setup, network observation, and behavioral assertions
• replace the untyped request listener with Playwright's Request type

This centralizes UI knowledge without moving scenario-specific assertions or API asset setup into page objects.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Not applicable; this is a Playwright test-architecture refactor with no product UI change.

TESTING INSTRUCTIONS

pre-commit run --files \
  superset-frontend/playwright/components/dashboard/DashboardFilterBar.ts \
  superset-frontend/playwright/components/dashboard/index.ts \
  superset-frontend/playwright/pages/DashboardPage.ts \
  superset-frontend/playwright/tests/dashboard/clear-all-filters.spec.ts

cd superset-frontend
npx playwright test \
  playwright/tests/dashboard/clear-all-filters.spec.ts \
  playwright/tests/dashboard/delete-display-control.spec.ts \
  --list --workers=1

Targeted formatting, lint, custom frontend rules, and frontend type-check pass. The required pre-commit run --all-files was also executed; its failures are unrelated checkout-wide baseline/environment issues (existing mapper-test mypy errors, absent docs eslint, unbuilt package declarations, and existing Ruff findings).

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.
✅ Project coverage is 65.05%. Comparing base (a2a7176) to head (0a200e6).

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #42017   +/-   ##
=======================================
  Coverage   65.05%   65.05%           
=======================================
  Files        2747     2747           
  Lines      153761   153761           
  Branches    35249    35249           
=======================================
+ Hits       100026   100027    +1     
+ Misses      51825    51824    -1     
  Partials     1910     1910           

Flag	Coverage Δ
javascript	70.43% <ø> (+<0.01%)	⬆️

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