Fix activity types display in dashboard

[joanagmaia]

Changes proposed ✍️

• Remove translation to render activity types, add a fallback instead
• Use merge method from lodash to merge custom and default activities, so if the same platforms exist on both, the activity types are merged instead of replaced by custom ones as it was before

What

🤖 Generated by Copilot at 8301a72

The pull request improves the dashboard UI by enhancing the display of activity types from different sources and avoiding errors when the tenant name is missing. It uses lodash.merge and optional chaining in dashboard-activity-types.vue and dashboard-page.vue.
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🤖 Generated by Copilot at 8301a72

To avoid errors from currentTenant
The code added a chaining element
It also merged types
From different pipes
And handled unknowns with a comment

Why

How

🤖 Generated by Copilot at 8301a72

• Handle unknown or unsupported activity types in dashboard by displaying a default text (link)
• Import and use merge function from lodash library to combine default and custom activity types without overwriting or losing nested properties (link, link)
• Add optional chaining operator to currentTenant.name expression in dashboard-page.vue to prevent errors if currentTenant is null or undefined (link)

Checklist ✅

• Label appropriately with Feature, Improvement, or Bug.
• Add screehshots to the PR description for relevant FE changes
• New backend functionality has been unit-tested.
• API documentation has been updated (if necessary) (see docs on API documentation).
• Quality standards are met.