Fix shorthand-property-no-redundant-values message

[ybiquitous]

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

Part of #5694

Is there anything in the PR that needs further explanation?

This PR fixes the message to use double quotes for consistency with other rules:

- Unexpected longhand value '1px 1px' instead of '1px'
+ Unexpected longhand value "1px 1px" instead of "1px"

This also adds test cases for end positions (#5694).

[ybiquitous]

[note] I don't think it's needed to change the arguments passed to report() since it should be helpful that the column range covers a declaration property and value.

stylelint/lib/rules/shorthand-property-no-redundant-values/index.js

Lines 170 to 175 in 26f4c35

	report({
	message: messages.rejected(value, shortestFormString),
	node: decl,
	result,
	ruleName,
	});

a { margin: 1px 1px }
/*  ^^^^^^^^^^^^^^^
    Unexpected longhand value "1px 1px" instead of "1px"
*/

[jeddy3]

Thanks!

[ybiquitous]

Changelog entry added:

• Fixed: shorthand-property-no-redundant-values message (#6272).