task template: import sqlite3 before pandas so pytest starts in images with an old system libstdc++

[ArjunS07]

Purpose: In some task images, pytest.main raises ImportError: ... libstdc++.so.6: version 'CXXABI_1.3.15' not found (required by .../libicui18n.so.78). The runner then records no tests, and the trial is graded unverified unless snapshots ran. This PR loads sqlite3 before pandas, so the env's libstdc++ is the one in the process.

How it works:

flowchart LR
    A["-p jinja_patch_plugin_pandas"] --> B["import sqlite3: libicu loads the env's libstdc++"]
    B --> C["import pandas"]
    C --> D["pytest-cov imports coverage, which imports sqlite3"]

Loading

Changes:

1. template/tests/jinja_patch_plugin_pandas.py imports sqlite3 first, inside try.
   • Effect: pytest starts in these images, and the selected tests run.
   • Before: pandas loaded /lib/x86_64-linux-gnu/libstdc++.so.6. The pytest-cov plugin then imported coverage, then sqlite3, and _sqlite3 failed to load. main() caught the exception and wrote strategy: null, changed_files: [].

Verification:

Real image fc-task/geopandas__geopandas__3151:d7542f43e0f2, no network, the oracle patch applied, pytest_runner.py --base <sha> --extra-args "-p jinja_patch_plugin_pandas":

plugin	result
before	ImportError from _sqlite3, 0 tests (the message is from the runner in #40, which writes it to note)
after	strategy: changed-files->tests, 4 test files, 383 passed and 4 skipped with the patch, 382 pass at base, 0 regressed

Notes:

• Phase 1 oracle records with this symptom: geopandas 3151, 3282, 3296, 3314, 3322 and UXARRAY 877, 1112. Only geopandas 3151 was run here. The others have the same output (strategy: null, no pytest output).
• Base: #38.