Add possibility to change URL color for Java or concrete language

### Description

Recently links became blue in javadoc comments in NB. Example

```
/**
* http://foo.com
*/
public void foo(){}
```
However link colors in javadoc comments (that are grey) mix them with code. So, when an eye sees something blue in javadoc then the mind asks - why code is there.

I opened a discusstion about it (https://github.com/apache/netbeans/discussions/6735) and I was advised to change link color.

However, this solutions sets URL color for ALL types of files, for example including markdown files as it is not possible to change URL color only for Java.

That's why I suggest to add possibility to change URL color for Java or for concrete language.

### Use case/motivation

_No response_

### Related issues

_No response_

### Are you willing to submit a pull request?

No

Review the reported URL-color behavior in JavaDoc comments and the linked discussion at github.com/apache/netbeans/discussions/6735. Trace how the current URL color setting applies across file types, then define how a language-specific setting would be configured and verified without changing colors for other formats.

Written by the indexing model from the issue text.