`Granite.CssClass.DESTRUCTIVE` and `Granite.CssClass.SUGGESTED` class names do not match pre-7.7.0 & Adw counterparts

We probably should keep with adw's definition for the class for compatibility purposes, and we already were following it pre-7.7.0.

## destructive-action

```vala
/* granite/lib/Constants.vala */
/**
* Style class for {@link Gtk.Button} with a destructive action
*/
[Version (deprecated = true, deprecated_since = "7.7.0", replacement = "Granite.CssClass.DESTRUCTIVE")]
public const string STYLE_CLASS_DESTRUCTIVE_ACTION = "destructive-action";

/**
* Style class for {@link Gtk.Button} with a destructive action
*/
[Version (since = "7.7.0")]
public const string DESTRUCTIVE = "destructive";
```

[https://gnome.pages.gitlab.gnome.org/libadwaita/doc/main/style-classes.html#destructive-action](https://gnome.pages.gitlab.gnome.org/libadwaita/doc/main/style-classes.html#destructive-action)

## suggested-action

```vala
/* granite/lib/Constants.vala */
/**
* Style class for when an action (usually a button) is the primary suggested action in a specific context.
*/
[Version (deprecated = true, deprecated_since = "7.7.0", replacement = "Granite.CssClass.SUGGESTED")]
public const string STYLE_CLASS_SUGGESTED_ACTION = "suggested-action";

/**
* Style class for when a {@link Gtk.Button} is the primary suggested action in a specific context.
*/
[Version (since = "7.7.0")]
public const string SUGGESTED = "suggested";
```
[https://gnome.pages.gitlab.gnome.org/libadwaita/doc/main/style-classes.html#suggested-action](https://gnome.pages.gitlab.gnome.org/libadwaita/doc/main/style-classes.html#suggested-action)

Open granite/lib/Constants.vala and inspect the DESTRUCTIVE, SUGGESTED, and deprecated style-class constants. Compare their values with the linked libadwaita style-class documentation and the pre-7.7.0 compatibility described in the issue. Done means the public class names match the Adwaita counterparts while preserving the documented deprecation aliases.

Written by the indexing model from the issue text.