Fix misaligned headers in the failed tests report table

[albertvillanova]

This PR fixes the headers of the failed tests table reported by the slow tests workflow.

Motivation

Each row of the table holds three fields, the test file, the test class and the truncated test name, but only two headers are passed to tabulate. As a result the header row is padded on the left and every column ends up with the wrong label, the file being reported under Test Location and the class under Test Name.

Before:

+-----------------+-----------------+----------------------------------+
|                 | Test Location   | Test Name                        |
+=================+=================+==================================+
| tests/test_b.py | TestBaz         | test_qux_with_a_very_long_name.. |
+-----------------+-----------------+----------------------------------+

After:

+-----------------+---------+-----------------------------+
| File            | Class   | Test Name                   |
+=================+=========+=============================+
| tests/test_b.py | TestBaz | test_qux_with_a_long_name.. |
+-----------------+---------+-----------------------------+

Changes

• Name the three columns of the failed tests table

---

Note

Low Risk
Reporting-only change in CI log formatting with no runtime or security impact.

Overview
Fixes mislabeled columns in the failed tests grid that log_reports.py prints for CI/Slack when pytest failures are reported.

Each row already splits nodeid into file, class, and a truncated test name, but tabulate was only given two headers (Test Location, Test Name), so labels shifted across columns. The change passes three headers—File, Class, Test Name—so the grid matches the data.

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[bot-ci-comment]

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