[MINOR][CONNECT][PYTHON] Fix stale running-task count in progress bar

[fallintoplace]

What changes were proposed in this pull request?

Update the running-task and stage state before rendering the Spark Connect progress bar. Add a regression assertion for the displayed running-task count.

Why are the changes needed?

Progress.update_ticks() previously called output() before storing the latest inflight_tasks value. Each progress message therefore displayed the running-task count from the previous update.

For example, the first update with 10 running tasks displayed 0 Tasks running. This change ensures that the rendered message uses values from the same progress update.

Does this PR introduce any user-facing change?

Yes. The Spark Connect progress bar now displays the current running-task count instead of the count from the previous update.

How was this patch tested?

Added a regression assertion to ProgressBarTest.test_simple_progress.

PYTHONPATH=python python -m unittest \
  pyspark.sql.tests.connect.shell.test_progress.ProgressBarTest

All five tests passed. Ruff lint and formatting checks also passed.

Was this patch authored or co-authored using generative AI tooling?

No

[HyukjinKwon]

Do you happen to know which change caused this regerssion?

[uros-b]

Thank you @fallintoplace!