Remove MaxDotGetExpressionWidth

[nojaf]

As we prepare for a major version update to support F# 9, I would like to propose the removal of the MaxDotGetExpressionWidth setting.

Description

This setting controls the maximum width for which nested SynExpr.DotGet expressions can remain on a single line.

Key Reasons for Removal:

• Since the introduction of the Chain AST node, this setting has become somewhat awkward and inconsistent.
• I am unaware of any users who actively utilize this setting; most people do not even know of its existence.
• In hindsight, I regret adding this as a configurable option, as there was no significant demand for it. The community's focus was on resolving the original problem, which has been addressed and remains so after the removal of this setting.
• This is one less setting to maintain, little things like this keep the lights on a bit longer.

@dawedawe, @josh-degraw & @Smaug123 (or @pleaseletmesearch) please let me know if you are on board with this.

[Smaug123]

Yes, this seems reasonable! Thanks.