feat to enable multiple SCPs

[itsnotsagar]

Why?

To support more than one SCP per OU

*Issue #724

What?

organizations.py organisation_policy.py

Description of changes: organizations.py

• function create_policy() to handle the updated logic
• function describe_policy_id_for_target() to handle the updated logic

organisation_policy.py

• _find_all() renamed to _find_all_paths() with updated filter
• clubbing _trim_scp_file_name() and _trim_tagging_policy_file_name() into one single function _trim_policy_file_name() with updated logic
• new function return_policy_name() added which returns the name of the SCP to be created
• updated clean_and_remove_policy_attachment() function to handle deletion of the newly added policy
• updated apply() function to handle exceptions and updated logic

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