Migrate bs-callout to GlAlert in clusters components

What does this MR do?

Replaces elements which used the bs-callout class with gl-alert elements from the GlAlert vue component.

Screenshots (strongly suggested)

@tauriedavis really sorry about this - I don't have an AWS or Google cloud account to be able to test getting Kubernetes up and running to see these alerts. I don't have any before or after changes. Nor am I able to see if the change has even worked.

before	after

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required) Not applicable for this change
• Code review guidelines
• Merge request performance guidelines Not applicable for this change
• Style guides Not applicable for this change
• Database guides Not applicable for this change
• Separation of EE specific content Not applicable for this change

Availability 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
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done Not applicable for this change

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~~ Not applicable for this change
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods Not applicable for this change
• Security reports checked/validated by a reviewer from the AppSec team Not applicable for this change

Related to #242022 (closed)