Temporarily Disabled Aggregation and Graph End-to-End Tests

[jaegeral]

Description:

During the development of PR [#[PR_NUMBER_HERE]](#3524), the end-to-end aggregation and graph
tests (end_to_end_tests/agg_test.py and end_to_end_tests/graph_test.py) were temporarily
disabled.

This action was necessary to unblock other test suites and ensure the overall stability of
the CI/CD pipeline, as these tests were consistently failing or exhibiting flakiness.

These tests represent functionality and should be re-enabled as soon as possible.
A dedicated pull request should be opened to address the underlying issues causing their
instability and re-integrate them into the test suite.

Action Items:

• Investigate and fix the root cause of failures/flakiness in end_to_end_tests/agg_test.py.
• Investigate and fix the root cause of failures/flakiness in end_to_end_tests/graph_test.py.
• Re-enable both test suites in a new, dedicated pull request.