Add regression tests for special characters in URLs

[marevol]

Summary

• Add regression tests for topic/2732 and topic/2733 covering special character handling in URL parsing across multiple client and transformer components
• Tests document current behavior for brackets, percent literals, curly braces, pipes, Unicode, and already-encoded characters

Changes Made

• FileSystemClientTest: Tests for preprocessUri with special chars (brackets, percent, curly braces, pipes, Unicode) and doGet with bracket/percent file paths
• FtpAuthenticationTest: Tests for matches() with special characters and percent-encoded paths
• FtpClientTest: Tests for FtpInfo parsing with brackets, literal percent, already-encoded percent, and mixed space/percent
• Hc4HttpClientTest: Tests for constructRedirectLocation with brackets, percent, Unicode, and HTML entity characters
• Hc5HttpClientTest: Same redirect location tests as Hc4 for the HttpComponents 5.x implementation
• HostIntervalControllerTest: Tests for host extraction from URLs containing brackets, percent, and spaces
• HtmlTransformerTest: Tests for URL resolution with brackets, percent, fragment-only links, and parent traversal edge cases

Testing

• All tests are self-contained and use temporary files where needed
• Tests document current behavior (some special chars cause exceptions) to detect regressions if URI handling changes

Additional Notes

• Tests reference topic/2732 (special characters causing URISyntaxException) and topic/2733 (Unicode/HTML entities in redirects)
• Some tests expect and catch exceptions to document known limitations

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