Jakub Smolar e978cc2a80 scylla_gdb: use persistent GDB - decrease test execution time ...

This commit replaces the previous approach of running pytest inside
GDB’s Python interpreter. Instead, tests are executed by driving a
persistent GDB process externally using pexpect.

- pexpect: Python library for controlling interactive programs
  (used here to send commands to GDB and capture its output)
- persistent GDB: keep one GDB session alive across multiple tests
  instead of starting a new process for each test

Tests can now be executed via `./test.py gdb` or with
`pytest test/scylla_gdb`. This improves performance and
makes failures easier to debug since pytest no longer runs
hidden inside GDB subprocesses.

Closes scylladb/scylladb#24804

2026-01-29 10:01:39 +02:00

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