Reduce API calls by fetching all jobs in single request

[khsrali]

Instead of making individual API requests per job ID, now fetch all jobs
in a single request and filter locally. This reduces the number of API
calls to the FirecREST server.

Also improves the retry logic:

• Reduce retry attempts from 5 to 3 with 0.5s sleep between attempts
• Add warning logs when jobs are not found after retries

[codecov]

Codecov Report

❌ Patch coverage is 77.77778% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.19%. Comparing base (f000725) to head (9d1e78a).

Files with missing lines	Patch %	Lines
aiida_firecrest/scheduler.py	77.77%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #127      +/-   ##
==========================================
+ Coverage   82.03%   82.19%   +0.16%     
==========================================
  Files           4        4              
  Lines         846      848       +2     
==========================================
+ Hits          694      697       +3     
+ Misses        152      151       -1     

Flag	Coverage Δ
pytests	82.19% <77.77%> (+0.16%)	⬆️

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[khsrali]

Update:
This has to wait, right now firecrest returns all jobs since 7 days ago. And frequent calling on /compute/jobs can introduce yet another overhead.