PHPCS errors from 3310884

Problem/Motivation

Fixes issue #3310884: Ability to clear keyword/search filter with one click seems to have introduced some new PHPCS issues:

FILE: ...ct_browser-3443929/tests/src/FunctionalJavascript/ProjectBrowserUiTest.php
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FOUND 3 ERRORS AFFECTING 3 LINES
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  980 | ERROR | [x] Visibility must be declared on method
      |       |     "testClearKeywordSearch" (Drupal.Scope.MethodScope.Missing)
  985 | ERROR | [x] Whitespace found at end of line
      |       |     (Squiz.WhiteSpace.SuperfluousWhitespace.EndLine)
 1000 | ERROR | [x] Whitespace found at end of line
      |       |     (Squiz.WhiteSpace.SuperfluousWhitespace.EndLine)
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PHPCBF CAN FIX THE 3 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: ...oject_browser-3443929/src/Plugin/ProjectBrowserSource/MockDrupalDotOrg.php
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FOUND 1 ERROR AFFECTING 1 LINE
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 89 | ERROR | [x] Multi-line function declaration not indented correctly;
    |       |     expected 2 spaces but found 3
    |       |     (Drupal.Functions.MultiLineFunctionDeclaration.Indent)
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PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: ...browser-3443929/src/EventSubscriber/DisableAddNewModuleRouteSubscriber.php
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FOUND 1 ERROR AFFECTING 1 LINE
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 21 | ERROR | [x] Multi-line function declarations must have a trailing comma
    |       |     after the last parameter
    |       |     (Drupal.Functions.MultiLineFunctionDeclaration.MissingTrailingComma)
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PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY

Steps to reproduce

See pipeline output: https://git.drupalcode.org/issue/project_browser-3443929/-/jobs/1453514

Proposed resolution

Correct PHPCS errors.