we should integrate with ACA managed spring-boot-admin

> Please provide us with the following information:
> ---------------------------------------------------------------
ACA has built in managed Spring Boot Admin, we should use that SBA rather deplying for code.

### This issue is for a: (mark with an `x`)
```
- [ ] bug report -> please search issues before submitting
- [ ] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)
```

### Minimal steps to reproduce
>

### Any log messages given by the failure
>

### Expected/desired behavior
>

### OS and Version?
> Windows 7, 8 or 10. Linux (which distribution). macOS (Yosemite? El Capitan? Sierra?)

### Versions
>

### Mention any other details that might be useful

> ---------------------------------------------------------------
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The issue names Azure Container Apps' managed Spring Boot Admin and asks to use it instead of deploying Spring Boot Admin code, but mentions no files, tests, or entry points. Start by locating how Spring Boot Admin is currently deployed and reviewing the ACA managed-service integration; done means the managed service is used without the existing self-deployed code.

Written by the indexing model from the issue text.