Improve 'any' search message during uv python install (#4940)

Special cases the `Any` request in output

e.g.,

```
❯ cargo run -q -- python install --isolated
warning: `uv python install` is experimental and may change without warning.
Searching for Python installations
Found existing installation: cpython-3.12.3-macos-aarch64-none
Python is already available. Use `uv python install <request>` to install a specific version.
```

instead of 

```
❯ cargo run -q -- python install --isolated
warning: `uv python install` is experimental and may change without warning.
Searching for Python versions matching: any Python
Found existing installation for any Python: cpython-3.12.3-macos-aarch64-none
Python is already available. Use `uv python install <request>` to install a specific version.
```

crates/uv/src/commands/python/install.rs

@@ -26,6 +26,7 @@ pub(crate) async fn install(
     native_tls: bool,
     connectivity: Connectivity,
     preview: PreviewMode,
+    isolated: bool,
     _cache: &Cache,
     printer: Printer,
 ) -> Result<ExitStatus> {
@@ -41,7 +42,12 @@ pub(crate) async fn install(
 
     let targets = targets.into_iter().collect::<BTreeSet<_>>();
     let requests: Vec<_> = if targets.is_empty() {
-        if let Some(requests) = requests_from_version_file().await? {
+        // Read from the version file, unless `isolated` was requested
+        if let Some(requests) = if isolated {
+            None
+        } else {
+            requests_from_version_file().await?
+        } {
             requests
         } else {
             vec![PythonRequest::Any]
@@ -61,21 +67,29 @@ pub(crate) async fn install(
     let installed_installations: Vec<_> = installations.find_all()?.collect();
     let mut unfilled_requests = Vec::new();
     for (request, download_request) in requests.iter().zip(download_requests) {
-        writeln!(
-            printer.stderr(),
-            "Searching for Python versions matching: {}",
-            request.cyan()
-        )?;
+        if matches!(requests.as_slice(), [PythonRequest::Any]) {
+            writeln!(printer.stderr(), "Searching for Python installations")?;
+        } else {
+            writeln!(
+                printer.stderr(),
+                "Searching for Python versions matching: {}",
+                request.cyan()
+            )?;
+        }
         if let Some(installation) = installed_installations
             .iter()
             .find(|installation| download_request.satisfied_by_key(installation.key()))
         {
-            writeln!(
-                printer.stderr(),
-                "Found existing installation for {}: {}",
-                request.cyan(),
-                installation.key().green(),
-            )?;
+            if matches!(request, PythonRequest::Any) {
+                writeln!(printer.stderr(), "Found: {}", installation.key().green(),)?;
+            } else {
+                writeln!(
+                    printer.stderr(),
+                    "Found existing installation for {}: {}",
+                    request.cyan(),
+                    installation.key().green(),
+                )?;
+            }
             if force {
                 writeln!(
                     printer.stderr(),

crates/uv/src/main.rs

@@ -776,6 +776,7 @@ async fn run() -> Result<ExitStatus> {
                 globals.native_tls,
                 globals.connectivity,
                 globals.preview,
+                globals.isolated,
                 &cache,
                 printer,
             )