Add a hint about the current file for TCL debugging

[madolson]

There are some tests like https://github.com/valkey-io/valkey/actions/runs/12403569355/job/34627292621 that fail and give no useful information since they are outside of a test context. Now we will at least get the file we are located in.

We can sort of reverse engineer where we are in the test by seeing which tests have finished in a file.

[TIMEOUT]: clients state report follows.
sock6 => (SPAWNED SERVER) pid:30375 - tests/unit/info.tcl
Killing still running Valkey server 30375 - tests/unit/info.tcl

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.61%. Comparing base (33f42d7) to head (4e2bade).
Report is 66 commits behind head on unstable.

Additional details and impacted files

@@             Coverage Diff              @@
##           unstable    #1459      +/-   ##
============================================
- Coverage     70.76%   70.61%   -0.15%     
============================================
  Files           116      116              
  Lines         63300    63264      -36     
============================================
- Hits          44793    44676     -117     
- Misses        18507    18588      +81     

see 49 files with indirect coverage changes

[enjoy-binbin]

great! it is hunting me for a long time.