refactor: add more rules to Prettier config, fix warnings (CP: 22.0)

[vursen]

Description

The PR adds the following rules to the project's Prettier config and fixes the related warnings:

• tabWidth: 2
• bracketSpacing: true
• trailingComma: all

Note, it is not a direct cherry-pick of #3725. I considered that it would be safer to run Prettier for the 22.0 branch individually than to try to resolve a potentially huge number of conflicts.

Related to #3725

Type of change

• Internal

Checklist

• I have read the contribution guide: https://vaadin.com/docs-beta/latest/guide/contributing/overview/
• I have added a description following the guideline.
• The issue is created in the corresponding repository and I have referenced it.
• I have added tests to ensure my change is effective and works as intended.
• New and existing tests are passing locally with my change.
• I have performed self-review and corrected misspellings.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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2.6% Duplication