fix(css): include inline css module in bundle (fix #6984,#7552)

[sapphi-red]

Description

This PR fixes #7552.
The issue title mentions SCSS, but it also happens with CSS.

fixes #6984
fixes #7552

Additional context

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the Commit Convention.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.

[patak-dev]

LGTM, thanks also for expanding the condition. It is interesting that we have been returning modulesCode even when it is not used, this could potentially fix other issues (like duplicated CSS that esbuild has issues tree-shacking).

We can do it in another PR, but we may want to create a getModulesCode() function so we can call it for the dev branch, but only for the build branch when it is actually going to be needed.

[poyoho]

may be there are same with #6996 ? 👀

[sapphi-red]

Oh I failed to find your PR. I think this PR is same with it.
I confirmed that this PR will also fix #6984.

[patak-dev]

@poyoho I think we should go with the implementation in this PR. Would you confirm that it covers the case you fixed in #6996? And it would be good if you could PR your test case to this one if you think it will help our CI, so we also get your name here ;)

[poyoho]

may be this PR cover my test 😊. so let it forward.