Move the SymbolFinder API over to SymbolAndProjectId

Fix pattern matching issue where an underscore could prevent viable matches.

Don't offer several code actions on identifiers that are likely intended to be C# keywords.

Add more scenarios to CSharpCodeActions

Outlining VSI tests

Fixes #18311 - Incorrect quick info for ValueTuple<T>

Use the project display name in FAR to support grouping

Update IDE Test Plan.md

Port the rename integration tests to the new framework.

Port the Formatting tests to the new framework

Don't create deferred projects for things that opt-out of DPL

Port Generate From Usage tests