fix: include command name in err/test tracking labels

[sahilmgandhi]

This PR stems from me writing a custom rtk script for company specific commands, and I wrapped them with rtk err. I would like for them to show up as individual entries when I run rtk gain to see how many came from my custom commands versus built in rtk commands.

Summary

• rtk err and rtk test hardcoded their tracking labels to "rtk run-err" and "rtk run-test", which meant rtk gain lumped all wrapped commands into a single generic entry with no visibility into which command was actually run
• Now the tracking label includes the wrapped command (e.g., rtk err pre-commit run --verbose, rtk test cargo test), consistent with how other subcommands like rtk gh pr view already track themselves

Test plan

• cargo test runner passes
• Run rtk err <some-command> and verify rtk gain --history shows the full label
• Verify rtk gain per-command breakdown shows distinct entries for different rtk err commands

Before

  All rtk err invocations collapse into a single opaque rtk run-err entry:

  Recent Commands
  ──────────────────────────────────────────────────
  02-23 04:00 ▲ rtk run-err               -98% (1.4K)
  02-23 03:55 ▲ rtk run-err               -23% (1.2K)
  02-23 03:50 • rtk run-err               -0% (0)

  By Command
  ──────────────────────────────────────────────────
    #  Command              Count   Saved    Avg%
  ──────────────────────────────────────────────────
    ?  rtk run-err              3   2.6K    40.4%

  No way to tell which commands were wrapped or where savings came from.

  After

  Each command gets its own identifiable entry:

  Recent Commands
  ──────────────────────────────────────────────────
  02-23 05:03 • rtk err echo hello wor... -29% (5)
  02-23 05:03 ▲ rtk err cat /Users/sah... -98% (360)
  02-23 05:03 ▲ rtk err ls -la /Users/... -98% (758)
  02-23 04:34 ▲ rtk err ls -la /Users/... -99% (1.3K)
  02-23 04:33 • rtk err echo testing g... -0% (0)