fix(ci): add missing SDK build step to cross-platform workflow_dispatch

[vjgit96]

Problem: The build-if-needed job was not building the langflow-sdk package. Since lfx depends on langflow-sdk>=0.1.0 and it's not yet on PyPI, all test jobs fail during lfx installation with "No solution found".

Failing run: https://github.com/langflow-ai/langflow/actions/runs/24050788103

Fix (same pattern as #12524):

Build langflow-sdk wheel in build-if-needed (cd src/sdk && uv build --wheel)
Upload SDK artifact (adhoc-dist-sdk) and output sdk-artifact-name
Update all SDK download/install conditions with build-if-needed fallback
Fix routing so combined SDK+LFX installer triggers when both come from build-if-needed

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 50.14%. Comparing base (f557b06) to head (1e74ecf).
⚠️ Report is 1 commits behind head on release-1.9.0.

Additional details and impacted files

@@                Coverage Diff                @@
##           release-1.9.0   #12536      +/-   ##
=================================================
+ Coverage          50.00%   50.14%   +0.14%     
=================================================
  Files               1930     1932       +2     
  Lines             171909   172044     +135     
  Branches           24071    25389    +1318     
=================================================
+ Hits               85958    86269     +311     
+ Misses             84905    84729     -176     
  Partials            1046     1046              

Flag	Coverage Δ
backend	55.92% <ø> (ø)
frontend	49.05% <ø> (+0.21%)	⬆️
lfx	49.07% <ø> (ø)

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see 186 files with indirect coverage changes

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[github-actions]

Frontend Unit Test Coverage Report

Coverage Summary

Lines	Statements	Branches	Functions
	29.72% (31355/105494)	63.74% (3985/6251)	31.06% (732/2356)

Unit Test Results

Tests	Skipped	Failures	Errors	Time
3112	0 💤	0 ❌	0 🔥	4m 59s ⏱️