Removes unused deprecation.h file

[TSNoble]

Description

Port of moveit/moveit#2693
Removes deprecation.h, which itself is marked as deprecated and is unused throughout the codebase.

Checklist

• Required by CI: Code is auto formatted using clang-format
• Extend the tutorials / documentation reference
• Document API changes relevant to the user in the MIGRATION.md notes
• Create tests, which fail without this PR reference
• Include a screenshot if changing a GUI
• While waiting for someone to review your request, please help review another open pull request to support the maintainers

[mikeferguson]

How can we possibly deprecate deprecation.h!

Also, "remove for noetic" - LOL

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.00%. Comparing base (d754dbd) to head (1821806).
Report is 1 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3128      +/-   ##
==========================================
+ Coverage   45.63%   46.00%   +0.38%     
==========================================
  Files         482      483       +1     
  Lines       40432    40632     +200     
==========================================
+ Hits        18448    18690     +242     
+ Misses      21984    21942      -42     

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[sea-bass]

Hah, nice.