Remove unused code

[LanderOtto]

This commit removes the LinkMergeMethod Enum object, which is no more used in the StreamFlow codebase. In addition, it simplifies the remap_token_value method by removing unused logic.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.52%. Comparing base (2403a0b) to head (0fe76e7).
Report is 2 commits behind head on master.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #673      +/-   ##
==========================================
+ Coverage   71.46%   71.52%   +0.05%     
==========================================
  Files          88       88              
  Lines       11373    11358      -15     
  Branches     1989     1983       -6     
==========================================
- Hits         8128     8124       -4     
+ Misses       2788     2778      -10     
+ Partials      457      456       -1     

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