This reverts commit 821daaf669fd66830cecc3e0da653163da7029c7.

Fixes https://devdiv.visualstudio.com/DevDiv/_workitems?id=403647

Avoid re-verifying semantics of nodes that cannot influence each other

Be resilient to projects with multiple versions for a given nuget package

Add extra logging to BuildBoss

Re-enable IBCMerge on workspaces

Reduce allocations in IsGeneratedSymbolWithGeneratedCodeAttribute.

Don't pass duplicate files/references to Roslyn projects

Failed tuple assignment gets a NoConversion node, and semantic model should handle BoundTupleLiteral (#19679)

Update System.Compression.Zip version to prevent downgrade warnings

Fixes #19405.

Now that we are using the correct version of IBCMerge we can re-enable its usage on our
workspaces components.

https://devdiv.visualstudio.com/DefaultCollection/DevDiv/_workitems?id=297536&_a=edit&triage=true

Only run OOP features if A/B experiment is enabled.

Optimize is null

This reverts commit 6dd74528.

Fixes package downgrade warnings in roslyn-internal

Add a specific WorkspaceKind for test workspaces.

Simplify metadata reference searching in Add-Import.

Remove unused parameter.

Boost priority of NavigateTo when running in OOP server.

Properly use ?. in an expression containing a nullable type.

Skip hanging test TestTagsChangedForEntireFile

Disable flakey test.

Move the symbol mapping service down to the Features layer.