feat(Application): Change "component" to "activity"

[hirokiterashima]

To make our UI more user-friendly, we're moving away from using the term "component", and replacing it with "activity". These changes are mostly in the authoring tool.

Examples of changes:

• "add component" -> "add activity"
• "component width" -> "activity width"
• "connected components" -> "connected activities"

Changes

• Change instances of "component" to "activity" and "components" to "activities", while keeping the letter-casing (e.g., Component -> Activity)
• Note that the code still uses the term "component" everywhere (e.g. node.addComponent())

Test

• Make sure that you don't see the term "component" anywhere as a teacher and student. Test the authoring tool in particular, because this was where it was heavily used.

[qltysh]

Coverage Impact

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

Modified Files with Diff Coverage (6)

Rating	File	% Diff	Uncovered Line #s
	...-components/edit-concept-map-connected-components.component.ts	100.0%
	...ingTool/milestones-authoring/milestones-authoring.component.ts	100.0%
	.../authoringTool/node/node-authoring/node-authoring.component.ts	100.0%
	...ponents/edit-multiple-choice-connected-components.component.ts	100.0%
	...nected-components/edit-match-connected-components.component.ts	100.0%
	...ol/node/add-component-button/add-component-button.component.ts	100.0%
	Total	100.0%

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• Diff Coverage: Coverage for added or modified lines of code (excludes deleted files). Learn more.

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