doc: fix inconsistencies in CJS code snippets

[aduh95]

Some of our snippets have 'use strict' statement and import process from node:process, and the vast majority does not (not explicit 'use strict', and use the global process).

[nodejs-github-bot]

Review requested:

• @nodejs/sqlite
• @nodejs/test_runner
• @nodejs/wasi

[JakobJingleheimer]

Isn't importing process from node:process recommended? (If someone, shouldn't the fix go the other direction?)

[aduh95]

Isn't importing process from node:process recommended? (If someone, shouldn't the fix go the other direction?)

It's enforced on ESM files/code snippets (IIRC the rationale is that folks writing CJS are likely writing Node.js-only code, and therefore will be more likely to use Node.js-only globals – and conversely, folks writing ESM would be more likely to not want to use Node.js-only globals)