test: add broken test of using no-unused-css-selector rule with compo…

[azat-io]

This test is broken.

I just want to show the problem with usage no-unused-css-selector rule.

The problem can be solved by deleting these lines of code:
https://github.com/ota-meshi/eslint-plugin-astro/blob/main/src/rules/no-unused-css-selector.ts#L478-L480

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[ota-meshi]

Hmm. I think perhaps to support that we need to check whether a string can be assigned to a tag variable.
I think it may be difficult to resolve the issue immediately.