feat(VLE): Add next button to bottom of step

[breity]

Changes

• Add "Next Step" button to bottom of each step that allows user to navigate to the next step (if it exists) for units in default navigation mode (not tabbed theme).
• Move next and previous step buttons next to each other (instead of on separate sides of the view) in tabbed navigation mode.

Test

• Make sure a "Next Step" button appears at the bottom of each step for units in default navigation mode.
• Ensure that the "Next Step" button successfully navigates to the next step when there are no constraints preventing user from opening the next step and shows the constraint info dialog when navigation forward is constrained.

[qltysh]

Coverage Impact

Unable to calculate total coverage change because base branch coverage was not found.

Modified Files with Diff Coverage (1)

Rating	File	% Diff	Uncovered Line #s
	.../wise5/directives/node-navigation/node-navigation.component.ts	100.0%
	Total	100.0%

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[hirokiterashima]

🎉 This PR is included in version 5.241.0 🎉

The release is available on GitHub release

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