Datasources: Fix Proxy by UID Failing for UIDs with a Hyphen (#61723)

Fix Proxy by UID Failing for UIDs with a Hyphen

Hyphens are allowed in short IDs but not picked up by the
proxyPathRegexp. This caused the end of the uid to be proxied as part of
the path to the backing datasource which would usually cause a 404.

pkg/services/datasourceproxy/datasourceproxy.go

@@ -132,7 +132,7 @@ func (p *DataSourceProxyService) proxyDatasourceRequest(c *models.ReqContext, ds
 	proxy.HandleRequest()
 }
 
-var proxyPathRegexp = regexp.MustCompile(`^\/api\/datasources\/proxy\/([\d]+|uid\/[\w]+)\/?`)
+var proxyPathRegexp = regexp.MustCompile(`^\/api\/datasources\/proxy\/([\d]+|uid\/[\w-]+)\/?`)
 
 func extractProxyPath(originalRawPath string) string {
 	return proxyPathRegexp.ReplaceAllString(originalRawPath, "")