Remove sanitizeUrl function

What does this MR do and why?

Remove sanitizeUrl function

The sanitation that sanitizeUrl offers is minimal. It returns about:blank for invalid URLs. sanitizeUrl is used only once.

Internally, sanitizeUrl uses new URL(...) to decide if a URL is valid. It is very unlikely that a URL like /${this.projectPath}/-/error_tracking/${errorId}.json won't be valid.

If the sanitation would have been proven more useful it would have been adopted broadly.

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