Move influxctl --perf-debug example output to command reference

[Copilot]

Relocates --perf-debug flag documentation and example output from release notes to the influxctl query command reference pages.

Changes:

• Added --perf-debug flag to Flags table in both Cloud Dedicated and Clustered query.md
• Added "Output query performance statistics" example section with:
  • Table and JSON format command examples
  • Collapsible example output for both formats
• Updated "View command updates" section to document v2.12.0 addition
• Removed verbose example output from release notes, keeping only feature description with link to query command reference
• Modernized placeholder syntax by replacing deprecated code-placeholders shortcode with new { placeholders="..." } attribute syntax

Example structure:

### Output query performance statistics

Use the `--perf-debug` flag to output performance statistics and gRPC response
trailers instead of query results.

{{< code-tabs-wrapper >}}
{{% code-tabs %}}
[Table format](#)
[JSON format](#)
{{% /code-tabs %}}
{{% code-tab-content %}}
```sh { placeholders="DATABASE_TOKEN|DATABASE_NAME" }
...

{{% /code-tab-content %}}
...
{{< /code-tabs-wrapper >}}

{{< expand-wrapper >}}
{{% expand "View example table-formatted performance statistics" %}}
...
{{% /expand %}}
{{< /expand-wrapper >}}

- [x] Signed the [InfluxData CLA](https://www.influxdata.com/legal/cla/)
  ([if necessary](https://github.com/influxdata/docs-v2/blob/master/DOCS-CONTRIBUTING.md#sign-the-influxdata-cla))
- [x] Rebased/mergeable

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[jstirnaman]

@copilot link to /influxdb3/version/reference/cli/influxctl/query/

[Copilot]

Done! Added link to the query command reference. Changes in commit cc8cd64.

[jstirnaman]

@copilot Use the new placeholder attribute syntax. code-placeholders is the deprecated shortcode.

[Copilot]

Done! Replaced the deprecated code-placeholders shortcode with the new { placeholders="..." } attribute syntax in both Cloud Dedicated and Clustered query.md files. Changes in commit cc8cd64.