Fix getting started cards re-direction to integrations

[ps48]

Description

Today getting started plugin uses href to navigate to integrations plugin using the EuiCards for integrations catalog. This becomes an issue when workspaces is enabled in OSD core as workspaces relies on url in browser for saved object scoping.

Issues Resolved

Removed the href call and replaced it with navigateToApp from core.

Check List

• [ ] New functionality includes testing.
  • [ ] All tests pass, including unit test, integration test and doctest
• [ ] New functionality has been documented.
  • [ ] New functionality has javadoc added
  • [ ] New functionality has user manual doc added
• [x] Commits are signed per the DCO using --signoff

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[TackAdam]

Tested with and without workspaces enabled, both working.

https://github.com/user-attachments/assets/57a7a11e-f45d-458b-85c6-c4b7047a7e56