Enable line charts in dashboard panels and embedded charts

What does this MR

This MR replaces the area chart with time series chart where used.

• Replace in panel_type.vue
• Replace in embed.vue
• Port changes to support embed in 2 cols in large screens
• Update specs

Feature	Screen
dashboard panel_type.vue
embed embed.vue

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry for user-facing changes, or community contribution. Check the link for other scenarios.
• Documentation created/updated or follow-up review issue created -> https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/32075
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Performance and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team

Closes #66073 (closed)