Remove dependency on buf index (#9391)

## Summary

These are now failing.

crates/uv/tests/it/pip_compile.rs

@@ -10246,47 +10246,6 @@ fn metadata_2_2() -> Result<()> {
     Ok(())
 }
 
-/// Resolve packages from an index that "doesn't support" zip file streaming (by way of using
-/// data descriptors).
-#[test]
-fn no_stream() -> Result<()> {
-    let context = TestContext::new("3.12");
-
-    // Write to a requirements file.
-    let requirements_in = context.temp_dir.child("requirements.in");
-    requirements_in
-        .write_str("hashb_foxglove_protocolbuffers_python==25.3.0.1.20240226043130+465630478360")?;
-    let constraints_in = context.temp_dir.child("constraints.in");
-    constraints_in.write_str("protobuf==5.26.0")?;
-
-    uv_snapshot!(context
-        .pip_compile()
-        .env_remove(EnvVars::UV_EXCLUDE_NEWER)
-        .arg("requirements.in")
-        .arg("-c")
-        .arg("constraints.in")
-        .arg("--extra-index-url")
-        .arg("https://buf.build/gen/python"), @r###"
-    success: true
-    exit_code: 0
-    ----- stdout -----
-    # This file was autogenerated by uv via the following command:
-    #    uv pip compile --cache-dir [CACHE_DIR] requirements.in -c constraints.in
-    hashb-foxglove-protocolbuffers-python==25.3.0.1.20240226043130+465630478360
-        # via -r requirements.in
-    protobuf==5.26.0
-        # via
-        #   -c constraints.in
-        #   hashb-foxglove-protocolbuffers-python
-
-    ----- stderr -----
-    Resolved 2 packages in [TIME]
-    "###
-    );
-
-    Ok(())
-}
-
 /// Resolve a direct URL package with a URL that doesn't exist (i.e., returns a 404).
 #[test]
 fn not_found_direct_url() -> Result<()> {

crates/uv/tests/it/pip_sync.rs

@@ -3381,37 +3381,6 @@ requires-python = ">=3.13"
     Ok(())
 }
 
-/// Install packages from an index that "doesn't support" zip file streaming (by way of using
-/// data descriptors).
-#[test]
-fn no_stream() -> Result<()> {
-    let context = TestContext::new("3.12");
-
-    // Write to a requirements file.
-    let requirements_txt = context.temp_dir.child("requirements.txt");
-    requirements_txt
-        .write_str("hashb_foxglove_protocolbuffers_python==25.3.0.1.20240226043130+465630478360")?;
-
-    uv_snapshot!(context.pip_sync()
-        .env_remove(EnvVars::UV_EXCLUDE_NEWER)
-        .arg("requirements.txt")
-        .arg("--index-url")
-        .arg("https://buf.build/gen/python"), @r###"
-    success: true
-    exit_code: 0
-    ----- stdout -----
-
-    ----- stderr -----
-    Resolved 1 package in [TIME]
-    Prepared 1 package in [TIME]
-    Installed 1 package in [TIME]
-     + hashb-foxglove-protocolbuffers-python==25.3.0.1.20240226043130+465630478360
-    "###
-    );
-
-    Ok(())
-}
-
 /// Raise an error when a direct URL dependency's `Requires-Python` constraint is not met.
 #[test]
 fn requires_python_direct_url() -> Result<()> {