Fix declaration-block-no-redundant-longhand-properties autofix for grid-template with repeat()

[mattxwang]

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

Closes #7228.

Is there anything in the PR that needs further explanation?

Added the test case from the issue + the swapped version with rows instead of columns.

Are we interested in making a repeat parser? I could add it to my personal backlog (though this would probably be after the ESM migration, etc.). I'm also not sure what existing tooling is here (maybe there's some existing csstools/postcss/other parser that we can use)?

[changeset-bot]

🦋 Changeset detected

Latest commit: 8902506

The changes in this PR will be included in the next version bump.

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stylelint	Patch

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[Mouvedia]

Are we interested in making a repeat parser?

As part of an existing package dependency or as an internal util?

[ybiquitous]

@mattxwang Thanks for the pull request. This is almost good to me. 👍🏼

Are we interested in making a repeat parser?

Such a parser may be present, but I think this PR's simple string check is enough for now (the parser seems over-engineering to me for now).

[ybiquitous]

Thanks. LGTM 👍🏼

[ybiquitous]

As part of an existing package dependency or as an internal util?

FYI. Note this is not required. Maybe @csstools/css-tokenizer might achieve that:
https://github.com/csstools/postcss-plugins/tree/HEAD/packages/css-tokenizer#readme
see also

stylelint/package.json

Line 138 in f1d3228

"@csstools/css-tokenizer": "^2.2.0",

cc @romainmenke