Fix LocalCache so that models/worlds downloaded via fuel.ignitionrobotics.org can be found in the cache

[azeey]

🦟 Bug fix

Fixes gazebosim/gz-sim#2281

Summary

LocalCache::MatchingModel and LocalCache::MatchingWorld are used to determine if a given Fuel URL is in the local cache. These functions used LocalCache::AllModels to get a list of all known models/worlds and compare them to the requested Fuel URL. The problem is that LocalCache::AllModel would only look for models/worlds in a predetermined directory, <cache location>/fuel.gazebosim.org:

gz-fuel-tools/src/LocalCache.cc

Lines 232 to 235 in a59c107

	for (auto &server : this->dataPtr->config->Servers())
	{
	std::string path = common::joinPaths(
	this->dataPtr->config->CacheLocation(), uriToPath(server.Url()));

However, since the argument to MatchingModel/MatchingWorld would already have the server URL, we shouldn't have to look through AllModels. This patch uses the path common::joinPaths( this->dataPtr->config->CacheLocation(), uriToPath(_id.Server().Url())); to look for models/worlds. The side effect of this is that Fuel URLs that use fuel.ignitionrobotics.org now work.

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
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