Composes should cascade within a block

If we have two classes on the same block that are composing other classes, it should _just work_. In the code block below, the resolved style should be that of `text-body[color=text]`.

tag.block.scss
```
:scope {
composes: 'text-body[color=text-on-dark]', 'text-body[size=small]';
border-radius: token('corner-radius-small');
padding: token('spacing-half-x') token('spacing-one-x');
}

// types
:scope[type=enabled] {
composes: 'text-body[color=text]';
background-color: token('color-background-none-active');
}
```

text-body.block.scss
```
/ defaults
:scope {
font-size: token('font-size-medium');
line-height: token('line-height-default');
font-weight: token('font-weight-regular');
color: token('color-text');
}

:scope[size=small] {
font-size: token('font-size-small');
}

:scope {
@include text-color('text');
@include text-color('text-low-emphasis');
@include text-color('action');
@include text-color('signal-positive');
@include text-color('signal-negative');
@include text-color('signal-neutral');
@include text-color('text-on-dark');
}
```

Start with the two example files, tag.block.scss and text-body.block.scss, and trace how CSS Blocks resolves multiple composes declarations within one block. Reproduce the example and inspect the resolved style output. Done means the enabled tag resolves the text color from the later composition while preserving the other composed and local styles.

Written by the indexing model from the issue text.