Remove Show/Hide geometry preview upstream

[QilongTang]

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Purpose

QNTM-4110
[GIT][Regression] Remove preview upstream from the context menu. Also referred as #8795

Removed menu items from context menu and resource string.

Before:

After:

Declarations

Check these if you believe they are true

• The code base is in a better state after this PR
• Is documented according to the standards
• The level of testing this PR includes is appropriate
• User facing strings, if any, are extracted into *.resx files
• All tests pass using the self-service CI.
• Snapshot of UI changes, if any.
• Changes to the API follow Semantic Versioning, and are documented in the API Changes document.

Reviewers

@alfarok

FYIs

@Racel

[alfarok]

We are probably going to see this happening more in VS2017 now, converting special characters to syntax automatically. I don't think there are any repercussions opening it back up in VS2015.

[alfarok]

@QilongTang LGTM

[QilongTang]

@alfarok @Racel Self CI also passed, merging