[tests-only][full-ci] test: add tests for opening files with # and ? in new tabs

[Asmitapaudel]

Description

Add Playwright end-to-end tests to cover the fix introduced in PR #12740, which fixes opening files whose names contain # or ? in a new tab.

The tests verify that files containing these special characters can be opened correctly using Ctrl+Click/middle-click and that the opened file is displayed correctly in the file viewer.

Folders containing # or ? are not included in these tests because folders use a different route producer (folderLinkUtils.getFolderLink) and are not affected by the change in PR #12740.

Related Issue

• part of: [QA] Add new automated tests #12472

Motivation and Context

How Has This Been Tested?

• test environment:
  • Locally
  • CI

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:

[kw-security]

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