Always include package names for Git and HTTPS dependencies (#3821)

## Summary

Related to https://github.com/astral-sh/uv/issues/3818. We should
_always_ include the package name if we know it's not a file path, even
if it starts with an environment variable.

crates/distribution-types/src/installed.rs

@@ -284,6 +284,16 @@ impl InstalledDist {
             Self::LegacyEditable(dist) => Some(&dist.target_url),
         }
     }
+
+    /// Return true if the distribution refers to a local file or directory.
+    pub fn is_local(&self) -> bool {
+        match self {
+            Self::Registry(_) => false,
+            Self::Url(dist) => matches!(&*dist.direct_url, DirectUrl::LocalDirectory { .. }),
+            Self::EggInfo(_) => false,
+            Self::LegacyEditable(_) => true,
+        }
+    }
 }
 
 impl DistributionMetadata for InstalledDist {

crates/distribution-types/src/lib.rs

@@ -427,6 +427,14 @@ impl Dist {
         }
     }
 
+    /// Return true if the distribution refers to a local file or directory.
+    pub fn is_local(&self) -> bool {
+        match self {
+            Self::Source(dist) => dist.is_local(),
+            Self::Built(dist) => dist.is_local(),
+        }
+    }
+
     /// Returns the [`IndexUrl`], if the distribution is from a registry.
     pub fn index(&self) -> Option<&IndexUrl> {
         match self {
@@ -452,6 +460,11 @@ impl Dist {
 }
 
 impl BuiltDist {
+    /// Return true if the distribution refers to a local file or directory.
+    pub fn is_local(&self) -> bool {
+        matches!(self, Self::Path(_))
+    }
+
     /// Returns the [`IndexUrl`], if the distribution is from a registry.
     pub fn index(&self) -> Option<&IndexUrl> {
         match self {
@@ -510,6 +523,11 @@ impl SourceDist {
         }
     }
 
+    /// Return true if the distribution refers to a local file or directory.
+    pub fn is_local(&self) -> bool {
+        matches!(self, Self::Directory(_) | Self::Path(_))
+    }
+
     /// Returns the path to the source distribution, if it's a local distribution.
     pub fn as_path(&self) -> Option<&Path> {
         match self {

crates/distribution-types/src/resolved.rs

@@ -45,6 +45,14 @@ impl ResolvedDist {
         }
     }
 
+    /// Return true if the distribution refers to a local file or directory.
+    pub fn is_local(&self) -> bool {
+        match self {
+            Self::Installable(dist) => dist.is_local(),
+            Self::Installed(dist) => dist.is_local(),
+        }
+    }
+
     /// Returns the [`IndexUrl`], if the distribution is from a registry.
     pub fn index(&self) -> Option<&IndexUrl> {
         match self {