Remove URI escaping from workspace service.

[aasimkhan30]

Description

Follow up to PR in vscode-mssql, remove escaping from file URI. microsoft/vscode-mssql#21229

Unfortunately, we were still doing that over here which broke query execution as the execution service was not able to find a URI match to get the SQL text.

Code Changes Checklist

• New or updated unit tests added
• All existing tests pass (dotnet test)
• Code follows contributing guidelines
• Logging/telemetry updated if relevant
• No protocol or behavioral regressions

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