refactor: Stabilize formatter

[MichaReiser]

Summary

Our JS Formatter is over-fitting on the test suite and it's very easy to introduce some stability issue when making any change to the formatter/printer.

I was able to narrow down the main sources of the instability issues and fixed them as best I could. However, this PR introduces two regressions that I want to address in follow up PRs.

1. Trailing commas in call arguments: call-arguments now always print a trailing comma. Fixing this requires more extensive rules that use BestFitting. See Call expression arguments formatting #2421 for the follow-up PR.
2. Formatting of inline comments. Inline comments aren't moved to the end anymore. This isn't ideal, I'm working on a follow up PR that re-defines the comment printing

This PR removes HardGroups. The main purpose of HardGroups was to more deterministically handle inline comments. This is no longer needed because this PR removes this inline comment printing and we need to come up with a comment printing that doesn't require every node to be wrapped inside of a HardGroup.

The "non-break" behaviour can be achieved by either just creating a sequence of tokens separated by spaces or using BestFitting where needed.

Test Plan

cargo test

[github-actions]

Parser conformance results on ubuntu-latest

js/262

Test result	main count	This PR count	Difference
Total	45878	45878	0
Passed	44938	44938	0
Failed	940	940	0
Panics	0	0	0
Coverage	97.95%	97.95%	0.00%

jsx/babel

Test result	main count	This PR count	Difference
Total	39	39	0
Passed	36	36	0
Failed	3	3	0
Panics	0	0	0
Coverage	92.31%	92.31%	0.00%

ts/babel

Test result	main count	This PR count	Difference
Total	588	588	0
Passed	519	519	0
Failed	69	69	0
Panics	0	0	0
Coverage	88.27%	88.27%	0.00%

ts/microsoft

Test result	main count	This PR count	Difference
Total	16257	16257	0
Passed	12391	12391	0
Failed	3866	3866	0
Panics	0	0	0
Coverage	76.22%	76.22%	0.00%

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[github-actions]

Playground for commit 238f710