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Fixes: #26588 For use cases like HPC, where `podman exec` is called in rapid succession, the standard exec process can become a bottleneck due to container locking and database I/O for session tracking. This commit introduces a new `--no-session` flag to `podman exec`. When used, this flag invokes a new, lightweight backend implementation that: - Skips container locking, reducing lock contention - Bypasses the creation, tracking, and removal of exec sessions in the database - Executes the command directly and retrieves the exit code without persisting session state - Maintains consistency with regular exec for container lookup, TTY handling, and environment setup - Shares implementation with health check execution to avoid code duplication The implementation addresses all performance bottlenecks while preserving compatibility with existing exec functionality including --latest flag support and proper exit code handling. Changes include: - Add --no-session flag to cmd/podman/containers/exec.go - Implement lightweight execution path in libpod/container_exec.go - Ensure consistent container validation and environment setup - Add comprehensive exit code testing including signal handling (exit 137) - Optimize configuration to skip unnecessary exit command setup Signed-off-by: Ryan McCann <ryan_mccann@student.uml.edu> Signed-off-by: ryanmccann1024 <ryan_mccann@student.uml.edu>