Unhide --isolated global argument (#5005)

## Summary

This PR makes the `--isolated` global argument visible, previously it
was hidden.
Fixes #4981.

## Test Plan

I ran `cargo run -- help` to verify `--isolated` was visible and it is.
I ran clippy with `cargo clippy --workspace --all-targets --all-features
--locked -- -D warnings` as CI does.

I also ran tests locally with:
```
cargo nextest run \
            --features python-patch \
            --workspace \
            --status-level skip --failure-output immediate-final --no-fail-fast -j 12 --final-status-level slow
```

crates/uv-cli/src/lib.rs

@@ -148,7 +148,7 @@ pub struct GlobalArgs {
 
     /// Avoid discovering a `pyproject.toml` or `uv.toml` file in the current directory or any
     /// parent directories.
-    #[arg(global = true, long, hide = true)]
+    #[arg(global = true, long)]
     pub isolated: bool,
 
     /// Show the resolved settings for the current command.

crates/uv/tests/help.rs

@@ -42,6 +42,9 @@ fn help() {
           --python-fetch <PYTHON_FETCH>
               Whether to automatically download Python when required [possible values: automatic,
               manual]
+          --isolated
+              Avoid discovering a `pyproject.toml` or `uv.toml` file in the current directory or any
+              parent directories
       -n, --no-cache
               Avoid reading from or writing to the cache [env: UV_NO_CACHE=]
           --cache-dir [CACHE_DIR]
@@ -98,6 +101,9 @@ fn help_flag() {
           --python-fetch <PYTHON_FETCH>
               Whether to automatically download Python when required [possible values: automatic,
               manual]
+          --isolated
+              Avoid discovering a `pyproject.toml` or `uv.toml` file in the current directory or any
+              parent directories
       -n, --no-cache
               Avoid reading from or writing to the cache [env: UV_NO_CACHE=]
           --cache-dir [CACHE_DIR]
@@ -153,6 +159,9 @@ fn help_short_flag() {
           --python-fetch <PYTHON_FETCH>
               Whether to automatically download Python when required [possible values: automatic,
               manual]
+          --isolated
+              Avoid discovering a `pyproject.toml` or `uv.toml` file in the current directory or any
+              parent directories
       -n, --no-cache
               Avoid reading from or writing to the cache [env: UV_NO_CACHE=]
           --cache-dir [CACHE_DIR]
@@ -249,6 +258,10 @@ fn help_subcommand() {
               - manual:    Do not automatically fetch managed Python installations; require explicit
                 installation
 
+          --isolated
+              Avoid discovering a `pyproject.toml` or `uv.toml` file in the current directory or any
+              parent directories
+
       -n, --no-cache
               Avoid reading from or writing to the cache
               
@@ -362,6 +375,10 @@ fn help_subsubcommand() {
               - manual:    Do not automatically fetch managed Python installations; require explicit
                 installation
 
+          --isolated
+              Avoid discovering a `pyproject.toml` or `uv.toml` file in the current directory or any
+              parent directories
+
       -n, --no-cache
               Avoid reading from or writing to the cache
               
@@ -429,6 +446,9 @@ fn help_flag_subcommand() {
           --python-fetch <PYTHON_FETCH>
               Whether to automatically download Python when required [possible values: automatic,
               manual]
+          --isolated
+              Avoid discovering a `pyproject.toml` or `uv.toml` file in the current directory or any
+              parent directories
       -n, --no-cache
               Avoid reading from or writing to the cache [env: UV_NO_CACHE=]
           --cache-dir [CACHE_DIR]
@@ -481,6 +501,9 @@ fn help_flag_subsubcommand() {
           --python-fetch <PYTHON_FETCH>
               Whether to automatically download Python when required [possible values: automatic,
               manual]
+          --isolated
+              Avoid discovering a `pyproject.toml` or `uv.toml` file in the current directory or any
+              parent directories
       -n, --no-cache
               Avoid reading from or writing to the cache [env: UV_NO_CACHE=]
           --cache-dir [CACHE_DIR]
@@ -590,6 +613,9 @@ fn help_with_global_option() {
           --python-fetch <PYTHON_FETCH>
               Whether to automatically download Python when required [possible values: automatic,
               manual]
+          --isolated
+              Avoid discovering a `pyproject.toml` or `uv.toml` file in the current directory or any
+              parent directories
       -n, --no-cache
               Avoid reading from or writing to the cache [env: UV_NO_CACHE=]
           --cache-dir [CACHE_DIR]