Remove Tools-Override/codeOptimization.targets

[dpodder]

dotnet/coreclr#10950 included a patch for BuildTools using the /Tools-Override mechanism for the file codeOptimization.targets. The override patch should be removed once BuildTools moves forward to version 1.0.27-prerelease-01513-01 or newer.

Note: only the /Tools-Override/codeOptimization.targets file needs to be removed; the other changes in dotnet/coreclr#10950 (to config.json) need to be left in.

[gkhanna79]

@dpodder Is this for 2.0?

[dpodder]

@gkhanna79 No, it's not; it's a tracking issue for maintainability. The fix can happen either before 2.0 or after 2.0, as far as this issue is concerned.

[dpodder]

Resolved by dotnet/coreclr#11620