chore: simplify style dedupe config

[wjhsf]

Details

A fast follow to #5264 with a simplification to the config that I thought of after the PR was merged.

Now we just have a single parameter, styleDedupe that accepts a string or boolean value. If a string is provided, deduplication is performed with the provided prefix. If true is provided, deduplication is performed with no prefix. Otherwise, deduplication is nor performed.

Does this pull request introduce a breaking change?

• 😮‍💨 No, it does not introduce a breaking change.
• 💔 Yes, it does introduce a breaking change.

Does this pull request introduce an observable change?

• 🤞 No, it does not introduce an observable change.
• 🔬 Yes, it does include an observable change.

GUS work item

[divmain]

We also need to change the test script so that styleDedupePrefix works correctly in config.json (see fixtures/style-dedupe-with-prefix).

[wjhsf]

I got sick, so this is no longer a fast follow. 🫠 Still think it's a good simplification to the API tho.

[wjhsf]

/nucleus ignore --reason "expected failure due to this change"

[divmain]

👏

[wjhsf]

/nucleus ignore --reason "This PR intentionally breaks webruntime"