Sort the paths in routes to ensure matcher picks nearest regex to request uri

[PKhivasra]

When the default backend routes are registered, currently it is as per unordered map. This means that the routes can have "" or "\api\v1" before "api\v1\query_range". When the router matches the regex expression (Refs: https://gecgithub01.walmart.com/Telemetry/trickster-v2/blob/main/pkg/router/route.go#L40 https://gecgithub01.walmart.com/Telemetry/trickster-v2/blob/main/pkg/router/regexp.go#L323) with the routes map, if partial routes appears first that will be considered as a match, which causes request to be "Proxy-Only". Thus, with sorting we will ensure that routes will be a sorted array in the descending order of path lengths, meaning: "\api\v1\query_range" would appear before "api\v1" and "" so that we have appropriate match.

Issue:https://github.com/trickstercache/trickster/issues/594

[PKhivasra]

Tested and working, thank you!

Thanks!