fix(telemetry): keep span status and events in SqliteSpanExporter

[mittalpk]

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Link to Issue or Description of Change

1. Link to an existing issue (if applicable):

• Closes: SqliteSpanExporter drops a span's status and events, so an exception that ended a run is lost (2.11.0) #7484

SqliteSpanExporter stored neither a span's status nor its events, so a span that ended with an exception read back as UNSET with no events. This stores the status code, status description and events, restores them in _row_to_readable_span, and adds the three columns to a database created by an earlier version when it is opened.

Testing Plan

Unit Tests:

• I have added or updated unit tests for my change.
• All unit tests pass locally.

pytest tests/unittests/telemetry: 880 passed, 7 xfailed. Four new tests in test_sqlite_span_exporter.py; the two covering status and events fail without the change.

Manual End-to-End (E2E) Tests:

Ran the reproduction script from #7484.

Before:

columns: [..., 'invocation_id', 'attributes_json']
status read back: UNSET
events read back: []

After:

columns: [..., 'invocation_id', 'attributes_json', 'status_code', 'status_description', 'events_json']
status read back: ERROR
events read back: [<opentelemetry.sdk.trace.Event object at 0x...>]

A database file written by the previous version is upgraded on open; that case has its own test.

Checklist

• I have read the CONTRIBUTING.md document.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.
• I have manually tested my changes end-to-end.
• Any dependent changes have been merged and published in downstream modules.

Additional context

The exporter is not imported elsewhere in this repository, so the end-to-end check above uses it directly through a TracerProvider, as the issue does.