fix: handle multiple uv installations in fail-missing-uv test (#4422)

## Summary

The `fail-missing-uv` acceptance test was failing on systems with
multiple `uv` installations because it only removed the first `uv`
directory from PATH.

The test script used `command -v uv` which returns only the first
matching binary. On systems with multiple `uv` installations (e.g., one
from homebrew at `/opt/homebrew/bin/uv` and another from a tool like
langflow at `~/.langflow/uv/uv`), the script would only remove one
directory, leaving other `uv` binaries accessible. This caused the test
to pass unexpectedly instead of failing with "uv: command not found".

**Fix:** Changed the script to loop through all `uv` installations using
`which -a uv` and remove each containing directory from PATH.

## Test plan

- [x] Verified the test now correctly fails with "uv: command not found"
on a system with multiple `uv` installations
- [x] Ran the full acceptance test suite to ensure no regressions

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: simonfaltum

acceptance/bundle/templates/default-python/fail-missing-uv/script

@@ -3,11 +3,11 @@ trace $CLI bundle init default-python --config-file ./input.json --output-dir ou
 cd output/fail_missing_uv
 trace $CLI bundle validate
 
-# Dynamically find the directory containing 'uv' and remove it from PATH
-uv_dir=$(dirname "$(command -v uv 2>/dev/null || which uv 2>/dev/null)")
-if [ -n "$uv_dir" ]; then
+# Dynamically find ALL directories containing 'uv' and remove them from PATH
+for uv_path in $(which -a uv 2>/dev/null); do
+  uv_dir=$(dirname "$uv_path")
   export PATH=$(echo "$PATH" | tr ':' '\n' | grep -v "^$uv_dir$" | paste -sd: -)
-fi
+done
 
 # Try to deploy, expect failure due to missing uv
 errcode trace $CLI bundle deploy