chore: docker file cleanup for base JDK removal and install of JDK25 (#41662)

## Description 
This is a housekeeping PR that removes an unnecessary step where we
previously deleted the JDK from the base image and reinstalled JDK 25.
Since the base image now already includes JDK 25, this manual
replacement is no longer required.


Fixes #`Issue Number`  
_or_  
Fixes `Issue URL`
> [!WARNING]  
> _If no issue exists, please create an issue first, and check with the
maintainers if the issue is valid._

## Automation

/ok-to-test tags=""

### :mag: Cypress test results
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## Communication
Should the DevRel and Marketing teams inform users about this change?
- [ ] Yes
- [ ] No


<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit

## Release Notes

* **Chores**
* Docker image no longer includes Java runtime by default. Users
requiring Java will need to provision it separately.

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