Update location of obj/ and bin/ directories to match Arcade conventions

[natemcmaster]

Part of #7280

This moves obj/ and bin/ directories into artifacts/bin/ and artifacts/obj/ to match where they will be when we adopt Microsoft.DotNet.Arcade.Sdk.

cref https://github.com/dotnet/arcade/blob/master/Documentation/ArcadeSdk.md#single-build-output

[natemcmaster]

@ryanbrandenburg can you think of any reason why changing the location of obj/ and bin/ would affect template tests?

Failed Templates.Test.SpaTemplateTest.ReactTemplateTest.ReactTemplate_Works_NetCore

Restoring NPM packages in '/home/vsts/work/1/s/src/ProjectTemplates/test/bin/Release/netcoreapp3.0/TestTemplates/AspNet.Template.3176cd/ClientApp' using npm...
==> bash -c "npm install" [/home/vsts/work/1/s/src/ProjectTemplates/test/bin/Release/netcoreapp3.0/TestTemplates/AspNet.Template.3176cd/ClientApp]

> [email protected] postinstall /home/vsts/work/1/s/src/ProjectTemplates/test/bin/Release/netcoreapp3.0/TestTemplates/AspNet.Template.3176cd/ClientApp/node_modules/uglifyjs-webpack-plugin
> node lib/post_install.js

[ERROR] npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents):
[ERROR] npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for [email protected]: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})
[ERROR] 
added 1362 packages from 847 contributors and audited 15215 packages in 40.621s
found 287 vulnerabilities (285 moderate, 2 high)
  run `npm audit fix` to fix them, or `npm audit` for details
==> bash -c "npm run lint" [/home/vsts/work/1/s/src/ProjectTemplates/test/bin/Release/netcoreapp3.0/TestTemplates/AspNet.Template.3176cd/ClientApp]

> [email protected] lint /home/vsts/work/1/s/src/ProjectTemplates/test/bin/Release/netcoreapp3.0/TestTemplates/AspNet.Template.3176cd/ClientApp
> eslint ./src/

[ERROR] Cannot find module 'typescript-eslint-parser'
[ERROR] Error: Cannot find module 'typescript-eslint-parser'
[ERROR]     at ModuleResolver.resolve (/home/vsts/work/1/s/src/ProjectTemplates/test/bin/Release/netcoreapp3.0/TestTemplates/AspNet.Template.3176cd/ClientApp/node_modules/eslint/lib/util/module-resolver.js:74:19)
[ERROR]     at loadFromDisk (/home/vsts/work/1/s/src/ProjectTemplates/test/bin/Release/netcoreapp3.0/TestTemplates/AspNet.Template.3176cd/ClientApp/node_modules/eslint/lib/config/config-file.js:509:42)
[ERROR]     at Object.load (/home/vsts/work/1/s/src/ProjectTemplates/test/bin/Release/netcoreapp3.0/TestTemplates/AspNet.Template.3176cd/ClientApp/node_modules/eslint/lib/config/config-file.js:559:20)
[ERROR]     at Config.getLocalConfigHierarchy (/home/vsts/work/1/s/src/ProjectTemplates/test/bin/Release/netcoreapp3.0/TestTemplates/AspNet.Template.3176cd/ClientApp/node_modules/eslint/lib/config.js:227:44)
[ERROR]     at Config.getConfigHierarchy (/home/vsts/work/1/s/src/ProjectTemplates/test/bin/Release/netcoreapp3.0/TestTemplates/AspNet.Template.3176cd/ClientApp/node_modules/eslint/lib/config.js:179:43)
[ERROR]     at Config.getConfigVector (/home/vsts/work/1/s/src/ProjectTemplates/test/bin/Release/netcoreapp3.0/TestTemplates/AspNet.Template.3176cd/ClientApp/node_modules/eslint/lib/config.js:286:21)
[ERROR]     at Config.getConfig (/home/vsts/work/1/s/src/ProjectTemplates/test/bin/Release/netcoreapp3.0/TestTemplates/AspNet.Template.3176cd/ClientApp/node_modules/eslint/lib/config.js:329:29)
[ERROR]     at processText (/home/vsts/work/1/s/src/ProjectTemplates/test/bin/Release/netcoreapp3.0/TestTemplates/AspNet.Template.3176cd/ClientApp/node_modules/eslint/lib/cli-engine.js:163:33)
[ERROR]     at processFile (/home/vsts/work/1/s/src/ProjectTemplates/test/bin/Release/netcoreapp3.0/TestTemplates/AspNet.Template.3176cd/ClientApp/node_modules/eslint/lib/cli-engine.js:224:18)
[ERROR]     at fileList.map.fileInfo (/home/vsts/work/1/s/src/ProjectTemplates/test/bin/Release/netcoreapp3.0/TestTemplates/AspNet.Template.3176cd/ClientApp/node_modules/eslint/lib/cli-engine.js:550:20)
[ERROR] npm ERR! code ELIFECYCLE
[ERROR] npm ERR! errno 1
[ERROR] npm ERR! [email protected] lint: `eslint ./src/`
[ERROR] npm ERR! Exit status 1
[ERROR] npm ERR! 
[ERROR] npm ERR! Failed at the [email protected] lint script.

[natemcmaster]

@ryanbrandenburg nevermind. Looks like this is already known - https://github.com/aspnet/AspNetCore-Internal/issues/1745. @mkArtakMSFT are you okay if I skip this test? There have been 6 failures in the last 4 hours