Add workflow count output to gh aw list command

[Copilot]

gh aw list was missing workflow count output that gh aw status displays, making the output inconsistent across commands.

Changes

• Added count message before table output in RunListWorkflows()
• Format: ✓ Found X workflow(s) using console.FormatSuccessMessage()
• Count reflects post-filter state (by pattern/labels)
• Text output only - JSON mode unchanged

Example

$ gh aw list
✓ Found 135 workflows
╭──────────────────────────────────┬───────┬────────┬──────╮
│Workflow                          │Engine │Compiled│Labels│
...

$ gh aw list ci-
✓ Found 3 workflows
╭─────────────────┬───────┬────────┬──────╮
│Workflow         │Engine │Compiled│Labels│
...

Original prompt

---

This section details on the original issue you should resolve

<issue_title>bug: "gh aw list": should also output number of workflows, similar to "gh aw status"</issue_title>
<issue_description>"gh aw list": should also output number of workflows, similar to "gh aw status"

currently, for this new command option, the output of number of workflows is missing.
Please implement this consistent with "gh aw status"

example:

gh aw status
✓ Fetched 1 public and 3 internal workflows
╭───────────────────┬─────────┬──────────┬────────┬────────────────┬────────┬────────────┬────────────────╮
│ Workflow          │ Engine  │ Compiled │ Status │ Time Remaining │ Labels │ Run Status │ Run Conclusion │
├───────────────────┼─────────┼──────────┼────────┼────────────────┼────────┼────────────┼────────────────┤
│ daily-team-status │ copilot │ Yes      │ active │ 30d 16h        │ -      │ -          │ -              │
╰───────────────────┴─────────┴──────────┴────────┴────────────────┴────────┴────────────┴────────────────╯

 gh aw list
╭───────────────────┬─────────┬──────────┬────────╮
│ Workflow          │ Engine  │ Compiled │ Labels │
├───────────────────┼─────────┼──────────┼────────┤
│ daily-team-status │ copilot │ Yes      │ -      │
╰───────────────────┴─────────┴──────────┴────────╯
```</issue_description>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes bug: "gh aw list": should also output number of workflows, similar to "gh aw status" #11306

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.