fix(ec2): Fix transit gateway route table propagation filtering

[HarshCasper]

A LocalStack user reported a 500 Internal Error when using the GetTransitGatewayRouteTablePropagations API with filters. The error occurred because the code treated route_table_propagation as a dictionary when it's a list of dictionaries.

2025-05-06 10:29:42     result = filter_resources(transit_gateway_route_tables, filters, attr_pairs)
2025-05-06 10:29:42              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2025-05-06 10:29:42   File "/opt/code/localstack/.venv/lib/python3.11/site-packages/moto/utilities/utils.py", line 97, in filter_resources
2025-05-06 10:29:42     len(attrs) == 3 and instance.get(attrs[2]) not in values
2025-05-06 10:29:42                         ^^^^^^^^^^^^
2025-05-06 10:29:42 AttributeError: 'list' object has no attribute 'get'

This PR fixed the filtering function, improved route table propagation iteration, and implemented multi-criteria resource matching. The solution was tested manually with AWS CLI, though the current tests are passing.

[codecov]

Codecov Report

Attention: Patch coverage is 4.76190% with 20 lines in your changes missing coverage. Please review.

Project coverage is 92.83%. Comparing base (570069d) to head (ef4e581).
Report is 77 commits behind head on master.

Files with missing lines	Patch %	Lines
moto/ec2/models/transit_gateway_route_tables.py	4.76%	20 Missing ⚠️

❌ Your patch status has failed because the patch coverage (4.76%) is below the target coverage (90.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8880      +/-   ##
==========================================
- Coverage   92.85%   92.83%   -0.02%     
==========================================
  Files        1282     1282              
  Lines      111792   111811      +19     
==========================================
+ Hits       103804   103805       +1     
- Misses       7988     8006      +18     

Flag	Coverage Δ
servertests	27.97% <0.00%> (-0.01%)	⬇️
unittests	92.81% <4.76%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[bblommers]

Hi @HarshCasper! Change LGTM - but this will need some tests.

If you just want to fix the 500-error, then I'm happy to merge a smaller PR with just this change without any tests:

- if transit_gateway_route_table.id in transit_gateway_route_table_id
+ if transit_gateway_route_table.id == transit_gateway_route_table_id

[bblommers]

Hey @HarshCasper, I think this has been fixed in #8951, as that significantly simplifies the overall RouteTable logic.

I'll close this, but let me know if the issue still exists though.