cspell: ignore sample/ and test/data/ directories

[Copilot]

Spell-check was flagging large volumes of false positives from test fixture data — binary pickles, CSVs with usernames/paths, and workload scripts in sample/. These are not source files and don't benefit from spell-checking.

Describe your changes

Added two entries to ignorePaths in .cspell.json:

• sample/** — workload scripts, staged tarballs, kernel build scripts, migration examples
• src/epmt/test/data/** — outlier fixtures (outliers/, outliers_nb/), CSV/TSV data, job metadata files

Issue ticket number, link (if applicable)

Checklist

A loose guide to provide structure for contributions

• the code runs
• the code is readable
• the code is commented
• there are no additional failures in GUARDED pipeline tasks
• a new test was written (if applicable)
• new instructions/doc was written (if applicable)
• I ran pylint and attempted to implement some of it's feedback

[ilaflott]

 Files checked: 130, Issues found: 3016 in 111 files.

also going to be a continue-on-error: true project