fix mergeimports issue in docgen

[sujaypatil96]

Merge PR #1308 first

This PR seeks to solve the problem that @noelmcloughlin was facing in PR #1283

[sujaypatil96]

@noelmcloughlin: if you agree with the changes in this PR, then we can merge this in and close out PR #1283

[codecov-commenter]

Codecov Report

Merging #1309 (376878d) into main (4ceeba1) will decrease coverage by 0.06%.
The diff coverage is 76.19%.

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@@            Coverage Diff             @@
##             main    #1309      +/-   ##
==========================================
- Coverage   80.33%   80.27%   -0.06%     
==========================================
  Files          77       77              
  Lines        8995     9065      +70     
  Branches     2212     2235      +23     
==========================================
+ Hits         7226     7277      +51     
- Misses       1347     1358      +11     
- Partials      422      430       +8     

Impacted Files	Coverage Δ
linkml/generators/typescriptgen.py	90.12% <ø> (-0.13%)	⬇️
linkml/utils/ifabsent_functions.py	81.81% <ø> (+0.42%)	⬆️
linkml/generators/common/type_designators.py	65.21% <69.23%> (-16.61%)	⬇️
linkml/generators/pydanticgen.py	86.19% <73.68%> (+0.92%)	⬆️
linkml/generators/yumlgen.py	93.42% <87.50%> (+0.27%)	⬆️
linkml/generators/docgen.py	84.50% <100.00%> (-0.88%)	⬇️
linkml/generators/javagen.py	81.15% <100.00%> (+0.27%)	⬆️
linkml/utils/schemaloader.py	78.55% <0.00%> (-0.56%)	⬇️
... and 6 more

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[noelmcloughlin]

#1311