Rely on matched route to emit path parameter

[prathamesh-sonpatki]

• Finding out and folding correct path from the request's URL is error prone. Instead we can rely on current request's matched route and emit its path as the path label.
• This removes any need of users needing to manually providing any input for custom URL folding. We just rely on their route definitions to which OpenAPM has access to.

[chtushar]

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