Ignore copyright symbols inside URLs during copyright detection

[dikshaa2909]

Fixes #4724

Summary

This PR fixes a false-positive issue where ScanCode detects copyright statements when a copyright symbol (c) appears inside a URL.

URLs such as:
http://example.com/(c)/path

were incorrectly treated as copyright candidates, even though they are not copyright statements.

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Problem

ScanCode’s copyright candidate detection logic treated (c) inside URLs as a valid copyright marker.
This resulted in incorrect detections when scanning text files containing URLs with (c) in the path.

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Solution

• Updated the copyright candidate detection logic to ignore copyright markers appearing inside URLs
• Added a regression test to ensure this behavior does not regress in the future

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Tests

• Added test_copyright_symbol_inside_url_is_ignored
• All existing tests pass successfully

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Tasks

• Reviewed contribution guidelines
• PR is descriptively titled 📑 and links the original issue above 🔗
• Tests pass -- look for a green checkbox ✔️ a few minutes after opening your PR
  (Tests also run locally)
• Commits are in a uniquely-named feature branch and have no merge conflicts 📁
• Updated documentation pages (not applicable)
• Updated CHANGELOG.rst (not applicable)

Signed of by dikshadeware@gmail.com