"Snap Modes" not having expected effect

[Ellord207]

The "Snap Modes" menu is not having the expected effect on tools. This behavior is different than what is observed in Design Review.

Steps:

• Open viewer app with default ui or Frontstage Sample.
• Start "Measure Tool"
• Open "Snap Mode" menu
• Select a different mode than "keypoints"

Expected:

• The measure tool snap will respect the snap mode selected in the "Snap Mode" menu.

Observed:

• The measure tool snap will continue to snap to keypoints.

[Ellord207]

Moved to core issues board: https://github.com/iTwin/itwinjs-core/issues/3892