chore: fix vue-ssr test warning

[sapphi-red]

Description

The following warning were shown when running pnpm test ssr-vue.

[Vue warn]: setup() return property "_p" should not start with "$" or "_" which are reserved prefixes for Vue internals.
[Vue warn]: setup() return property "$id" should not start with "$" or "_" which are reserved prefixes for Vue internals.
[Vue warn]: setup() return property "$onAction" should not start with "$" or "_" which are reserved prefixes for Vue internals.
[Vue warn]: setup() return property "$patch" should not start with "$" or "_" which are reserved prefixes for Vue internals.
[Vue warn]: setup() return property "$reset" should not start with "$" or "_" which are reserved prefixes for Vue internals.
[Vue warn]: setup() return property "$subscribe" should not start with "$" or "_" which are reserved prefixes for Vue internals.
[Vue warn]: setup() return property "$dispose" should not start with "$" or "_" which are reserved prefixes for Vue internals.
[Vue warn]: setup() return property "_hotUpdate" should not start with "$" or "_" which are reserved prefixes for Vue internals.

refs #10366

Additional context

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following

• 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.