Create component to display area and line charts in monitor dashboards

What does this MR do?

This MR:

• Creates a new <monitor-time-series-chart> component, which is a more general version of <monitor-area-chart> which considers both area and line charts.
  • <monitor-area-chart> Is still kept, but it should be replaced by monitor-time-series moving forward.
• Updates the common metrics dashboard to see the component in action and dogfood the new chart variant.
  • See: https://gitlab.com/gitlab-org/gitlab-ce/issues/65412#note_201806371

Local test: The component is used it looks like this:

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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 Please see: https://gitlab.com/gitlab-org/gitlab-ce/issues/66132
• 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 #65412 (moved)