feat: add filtering options to provisioners list (#19378)

## Summary

In this pull request we're adding support for additional filtering
options to the `provisioners list` CLI command and the
`/provisionerdaemons` API endpoint.

Resolves: https://github.com/coder/coder/issues/18783

### Changes

#### Added CLI Options

- `--show-offline`: When this option is provided, all provisioner
daemons will be returned. This means that when `--show-offline` is not
provided only `idle` and `busy` provisioner daemons will be returned.
- `--status=<list_of_statuses>`: When this option is provided with a
comma-separated list of valid statuses (`idle`, `busy`, or `offline`)
only provisioner daemons that have these statuses will be returned.
- `--max-age=<duration>`: When this option is provided with a valid
duration value (e.g., `24h`, `30s`) only provisioner daemons with a
`last_seen_at` timestamp within the provided max age will be returned.

#### Query Params

- `?offline=true`: Include offline provisioner daemons in the results.
Offline provisioner daemons will be excluded if `?offline=false` or if
offline is not provided.
- `?status=<list_of_statuses>`: Include provisioner daemons with the
specified statuses.
- `?max_age=<duration>`: Include provisioner daemons with a
`last_seen_at` timestamp within the max age duration.

#### Frontend

- Since offline provisioners will not be returned by default anymore
(`--show-offline` has to be provided to see them), a checkbox was added
to the provisioners list page to allow for offline provisioners to be
displayed
- A revamp of the provisioners page will be done in:
https://github.com/coder/coder/issues/17156, this checkbox change was
just added to maintain currently functionality with the backend updates

Current provisioners page (without checkbox)

<img width="1329" height="574" alt="Screenshot 2025-08-20 at 10 51
00 AM"
src="https://github.com/user-attachments/assets/77b73650-0b62-44f0-a77f-acbe5710809f"
/>

Provisioners page with checkbox (unchecked)

<img width="1314" height="626" alt="Screenshot 2025-08-20 at 10 48
40 AM"
src="https://github.com/user-attachments/assets/7ba164ad-6d3f-417b-bd39-338c0161b145"
/>

Provisioner page with checkbox (checked) and URL updated with query
parameters

<img width="1306" height="597" alt="Screenshot 2025-08-20 at 10 50
14 AM"
src="https://github.com/user-attachments/assets/e78d0986-bbf8-491b-9d56-b682973237a0"
/>

### Show Offline vs Offline Status

To list offline provisioner daemons, users can either:

1. Include the `--show-offline` option

OR

2. Include `offline` in the list of values provided to the `--status`
option

coderd/httpapi/queryparams.go

@@ -287,6 +287,29 @@ func (p *QueryParamParser) JSONStringMap(vals url.Values, def map[string]string,
 	return v
 }
 
+func (p *QueryParamParser) ProvisionerDaemonStatuses(vals url.Values, def []codersdk.ProvisionerDaemonStatus, queryParam string) []codersdk.ProvisionerDaemonStatus {
+	return ParseCustomList(p, vals, def, queryParam, func(v string) (codersdk.ProvisionerDaemonStatus, error) {
+		return codersdk.ProvisionerDaemonStatus(v), nil
+	})
+}
+
+func (p *QueryParamParser) Duration(vals url.Values, def time.Duration, queryParam string) time.Duration {
+	v, err := parseQueryParam(p, vals, func(v string) (time.Duration, error) {
+		d, err := time.ParseDuration(v)
+		if err != nil {
+			return 0, err
+		}
+		return d, nil
+	}, def, queryParam)
+	if err != nil {
+		p.Errors = append(p.Errors, codersdk.ValidationError{
+			Field:  queryParam,
+			Detail: fmt.Sprintf("Query param %q must be a valid duration (e.g., '24h', '30m', '1h30m'): %s", queryParam, err.Error()),
+		})
+	}
+	return v
+}
+
 // ValidEnum represents an enum that can be parsed and validated.
 type ValidEnum interface {
 	// Add more types as needed (avoid importing large dependency trees).