Blocks with variables shouldn't show "create var getter" option in context menu when in flyout

[samelhusseini]

Problem statement

Blocks with variables as inputs shouldn't show the create variable getter in their context menus when inside a flyout. (Just like variable getter / setter blocks)

Expected Behavior

Context menu doesn't show the create getter option when inside the flyout.

Actual Behavior

Context menu does show the option, and when clicking on the option, the getter is created and orphaned inside the flyout workspace.

Steps to Reproduce

1. Start by opening the Loops category in the Blockly playground.
2. Next, right click on the for block and select the 'Create "get VARIABLE_ID"' block (variable id should be variable name, see Variable context menu create getter option prints out variable id instead of name #1740)
3. Click on that option. (A new variable_get block is created but it is orphaned inside of the flyout workspace)

Operating System and Browser

Tested on Chrome.
Should repro on all.

Additional Information

[samelhusseini]

Same issue with functions and their 'create function' option.

[samelhusseini]

This is fixed.