## Description 

This PR introduces a new `list presets` command to display the presets
associated with a given template.
By default, it displays the presets for the template's active version,
unless a `--template-version` flag is provided.

## Changes

* Added a new `list presets` command under `coder templates presets` to
display presets associated with a template.
* By default, the command lists presets from the template’s active
version.
* Users can override the default behavior by providing the
`--template-version` flag to target a specific version.

```
> coder templates versions presets list --help

USAGE:
  coder templates presets list [flags] <template>

  List all presets of the specified template. Defaults to the active template version.

OPTIONS:
  -O, --org string, $CODER_ORGANIZATION
          Select which organization (uuid or name) to use.

  -c, --column [name|parameters|default|desired prebuild instances] (default: name,parameters,default,desired prebuild instances)
          Columns to display in table output.

  -o, --output table|json (default: table)
          Output format.

      --template-version string
          Specify a template version to list presets for. Defaults to the active version.
```

Related PR: #18912 - please consider
both PRs together as they’re part of the same workflow
Relates to issue: #16594

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* Added CLI commands to manage and list presets for specific template
versions, supporting tabular and JSON output.
* Introduced a new CLI subcommand group for template version presets,
including detailed help and documentation.
* Added support for displaying and managing the desired number of
prebuild instances for presets in CLI, API, and UI.

* **Documentation**
* Updated and expanded CLI and API documentation to describe new
commands, options, and the desired prebuild instances field in presets.
* Added new help output and reference files for template version presets
commands.

* **Bug Fixes**
* Ensured correct handling and display of the desired prebuild instances
property for presets across CLI, API, and UI.

* **Tests**
* Introduced end-to-end tests for listing template version presets,
covering scenarios with and without presets.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

* Adds a preset selector in TasksPage with the default preset pre-selected and at the top of the list.
* If no default preset exists, the user is prompted to select one.
* If a preset defines an AI Prompt, it will override the textarea.