fix(server): raise error if search fallback fails

[sbrunato]

• stores search errors in dag.search_errors during search fallback
• raises an error in server mode if search fallback fails
• raise_errors enabled when search by id

[github-actions]

Test Results

    4 files  ±0      4 suites  ±0   4m 17s ⏱️ +3s
  453 tests +1    450 ✅ +1   3 💤 ±0  0 ❌ ±0 
1 812 runs  +4  1 734 ✅ +4  78 💤 ±0  0 ❌ ±0 

Results for commit a0f6258. ± Comparison against base commit dda681a.

[github-actions]

Code Coverage (Ubuntu)

File	Coverage
All files	82%	✅

Minimum allowed coverage is 70%

Generated by 🐒 cobertura-action against a0f6258

[github-actions]

Code Coverage (Windows)

File	Coverage
All files	76%	✅

Minimum allowed coverage is 70%

Generated by 🐒 cobertura-action against a0f6258