Fixes #6502
Fixes #6501

Background

• BundleAlgo template_path points to algorithm_templates/<Algo> <= MONAI 1.1. Recent PR Make Auto3DSeg algo able to find algorithm templates #6436 changed that to algorithm_templates and make it easier to instantiate the BundleAlgo from "algorithm_templates" folder when the folders are moved.
• But BundleGen did not update accordingly and still save algorithm_templates/<Algo> as the template_path , which breaks NNI HPO feature which relies heavily on these paths.

Description

• Make template_path points to algorithm_templates
• Avoid using the latest filelock (3.12.0) which breaks nni
• Fix comments in Redo Auto3dseg ensemble path fix #6485 (comment) in Redo Auto3dseg ensemble path fix #6485

Types of changes

• Non-breaking change (fix or new feature that would not break existing functionality).
• New tests added to cover the changes.
• Integration tests passed locally by running ./runtests.sh -f -u --net --coverage.
• Quick tests passed locally by running ./runtests.sh --quick --unittests --disttests.
• In-line docstrings updated.