fix(ebpf): handle case when self is put in cell

[korniltsev]

• fix case when self is captured by some inner scope (functions or lambdas) - see reproducer
• add try_... macros to maybe cleanup code
• move code related to class names to a separate function get_class_name with early returns to minimize nesting
• speedup test by pulling images concurrently and decreasing loadgen
• change playground config to embed SessionOptions to avoid code duplication

Reproducer:

https://github.com/pyroscope-io/pyroscope-ebpf-testdata/blob/e567550674d0312c3a2f2d07ea3bb395a13a085b/rideshare-flask-no-pip/lib/server.py#L45-L59

[simonswine]

LGTM