Minor TODO fixes

[VisLab]

No description provided.

[Copilot]

Pull request overview

This PR removes deprecated code and modernizes Python version compatibility by replacing a custom remove_prefix utility function with Python's built-in str.removeprefix() method, and deletes unused test and implementation files.

Changes:

• Replaced custom remove_prefix function with Python's built-in str.removeprefix() method across multiple files
• Removed the now-unused remove_prefix function definition from df_util.py
• Deleted unused SequenceMap class implementation and its associated test file
• Updated the hed-examples subproject commit reference

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/tools/analysis/test_sequence_map.py	Removed entire test file for unused SequenceMap functionality
spec_tests/hed-examples	Updated subproject commit reference
hed/tools/analysis/sequence_map.py	Removed entire SequenceMap class implementation
hed/schema/schema_io/schema2df.py	Removed import and replaced remove_prefix call with removeprefix()
hed/schema/schema_io/hed_id_util.py	Removed import and replaced remove_prefix calls with removeprefix(), added null check
hed/schema/schema_io/df_util.py	Removed deprecated remove_prefix function definition
hed/schema/schema_attribute_validator_hed_id.py	Removed import and replaced remove_prefix calls with removeprefix()

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