fix: golang PURL should include full module (#4395)

* fixed #4316 go mod with ver purl

Signed-off-by: Rez Moss <hi@rezmoss.com>

* go mod purl fixed, added func to handle go.mod

Signed-off-by: Rez Moss <hi@rezmoss.com>

* fix: use module name in PURL string everywhere

Signed-off-by: Keith Zantow <kzantow@gmail.com>

---------

Signed-off-by: Rez Moss <hi@rezmoss.com>
Signed-off-by: Keith Zantow <kzantow@gmail.com>
Co-authored-by: Keith Zantow <kzantow@gmail.com>

syft/pkg/cataloger/golang/config_test.go

@@ -57,6 +57,7 @@ func Test_Config(t *testing.T) {
 				Proxies:                     []string{"https://my.proxy"},
 				NoProxy:                     []string{"my.private", "no.proxy"},
 				MainModuleVersion:           DefaultMainModuleVersionConfig(),
+				UsePackagesLib:              true,
 			},
 		},
 		{
@@ -84,6 +85,7 @@ func Test_Config(t *testing.T) {
 				Proxies:                     []string{"https://alt.proxy", "direct"},
 				NoProxy:                     []string{"alt.no.proxy"},
 				MainModuleVersion:           DefaultMainModuleVersionConfig(),
+				UsePackagesLib:              true,
 			},
 		},
 	}