Add ELN export for samples and sample graphs

[BenjaminCharmes]

Closes #1385

• Add ELN export button for individual samples
• Add modal to export related sample graphs
• Unify ExportButton component for collections and samples
• Refactor create_eln_file to handle both collections and samples

[cypress]

datalab    Run #4028

Run Properties:   Passed #4028  •  400b2446e9 ℹ️: Merge 8187b86e6adb39ae039b93dabcebd95a32647fd0 into 0103231fd5ac4da4c43f5519a888...

Project	datalab
Branch Review	bc/eln-button
Run status	Passed #4028
Run duration	07m 52s
Commit	400b2446e9 ℹ️: Merge 8187b86e6adb39ae039b93dabcebd95a32647fd0 into 0103231fd5ac4da4c43f5519a888...
Committer	Ben Charmes
View all properties for this run ↗︎

---

Test results
Failures	0
Flaky	0
Pending	0
Skipped	0
Passing	336
View all changes introduced in this branch ↗︎

[codecov]

Codecov Report

❌ Patch coverage is 68.51852% with 85 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.45%. Comparing base (3ef27ff) to head (8187b86).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
pydatalab/src/pydatalab/routes/v0_1/export.py	56.00%	44 Missing ⚠️
pydatalab/src/pydatalab/export_utils.py	76.13%	21 Missing ⚠️
pydatalab/src/pydatalab/scheduler.py	44.11%	19 Missing ⚠️
pydatalab/src/pydatalab/routes/v0_1/graphs.py	95.45%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1389      +/-   ##
==========================================
- Coverage   80.12%   79.45%   -0.67%     
==========================================
  Files          70       74       +4     
  Lines        4794     5052     +258     
==========================================
+ Hits         3841     4014     +173     
- Misses        953     1038      +85     

Files with missing lines	Coverage Δ
pydatalab/src/pydatalab/models/export_task.py	100.00% <100.00%> (ø)
pydatalab/src/pydatalab/mongo.py	81.81% <100.00%> (+0.99%)	⬆️
pydatalab/src/pydatalab/routes/v0_1/__init__.py	100.00% <100.00%> (ø)
pydatalab/src/pydatalab/routes/v0_1/graphs.py	97.70% <95.45%> (-1.01%)	⬇️
pydatalab/src/pydatalab/scheduler.py	44.11% <44.11%> (ø)
pydatalab/src/pydatalab/export_utils.py	76.13% <76.13%> (ø)
pydatalab/src/pydatalab/routes/v0_1/export.py	56.00% <56.00%> (ø)

... and 1 file with indirect coverage changes

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[BenjaminCharmes]

• Export Button/Dropdown in Navbar
• itemGraph in ExportModal
• itemGraph depth control (reusable component)