fix: add the missing globals we use to the playground templates

[lerouxb]

I noticed that this started happening where some newly created playgrounds stated off red:

So far it seems to only happen if vscode's active workspace is vscode itself. The error is coming from eslint and I guess at some point something changed in how it resolves the eslint config or in vscode's config or it picks up vscode's config..

Probably not really an issue for most real users, but I did notice that all our playground templates except three have the /* global use, db */ (or whatever globals get used in the template) pattern at the top and that fixes it.

Might as well align those?

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Four options:

• it is effectively the user's eslint config breaking it here, so we can decide it is their responsibility
• we can add all the globals they could ever use, add eslint config to ignore unused globals or add eslint config to just turn off validation for using undefined globals, etc. (some variation or combination of those)
• we could not make playgrounds .js files but rather make a new format that just happens to be using js parsers under the hood and then eslint or similar cannot accidentally match it
• we could just live with it ;)

[Copilot]

Pull request overview

Aligns MongoDB playground templates with the project’s existing pattern of declaring the runtime globals used in playground files (e.g., use, db) so ESLint doesn’t flag newly created playgrounds as no-undef in certain workspace/config resolution scenarios.

Changes:

• Add /* global use, db */ to the “insert document” playground template.
• Add /* global use */ to the “from database tree item” playground template.
• Add /* global use, db */ to the “from collection tree item” playground template.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/templates/playgroundInsertDocumentTemplate.ts	Adds missing ESLint globals directive for use and db in the generated playground content.
src/templates/playgroundFromDatabaseTreeItemTemplate.ts	Adds missing ESLint globals directive for use in the generated playground content.
src/templates/playgroundFromCollectionTreeItemTemplate.ts	Adds missing ESLint globals directive for use and db in the generated playground content.

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[Anemy]

Since this is the same string in every playground, would it make sense for us to put it into a helper function? So all of them then call that templateHeader. Not a blocker, fine as is.