use additional gids,user,group in exec, inject path iif not given

[YJDoc2]

Description

This fixes few issues with the current exec command implementation

• This uses PATH from original spec if it is not explicitly specified for the exec. Currently exec simply fails if PATH is not given, and users have to manually give PATH for exec command. This will use PATH from original spec by default
• This passes on uid, gid and additional gids provided to exec command. Currently we accept these args, but simply ignore them ; because of which we cannot exec into the container with specific uid/gid. With this fix, proper uid/gid will be used.

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring (no functional changes)
• Performance improvement
• Test updates
• CI/CD related changes
• Other (please describe):

Testing

• Added new unit tests
• Added new integration tests
• Ran existing test suite
• Tested manually
  • Run the same steps as described in issue Unable to Use ping in Busybox Container Created with Youki (Root User) #3069 runc differences given the same config.json #2756 and make sure it works with this branch, as it is not working on main.

Related Issues

Fixes #3069 , Fixes #2756

Additional Context

N/A