Refactor declaration-property-value-no-unknown to reuse parsed CSSTree node

[ybiquitous]

Which issue, if any, is this issue related to?

Follow-up for #6511

Is there anything in the PR that needs further explanation?

According to the CSSTree doc, it is likely a typical case to pass a node to lexer.matchProperty().

CSSTree Usage

// parse CSS to AST as a declaration value
const ast = csstree.parse('red 1px solid', { context: 'value' });

// match to syntax of `border` property
const matchResult = csstree.lexer.matchProperty('border', last);

I guess this change may reduce extra parsing, but I'm not sure about the implementation details of CSSTree.

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[jeddy3]

LGTM, thank you!