[FSTrigger] - Monitor folder: when i use "%JENKINS_HOME%\<workspaceLoc>\<projectName>\target" is not working but working when i use direct path like "D:\Jenkins\<workspaceLoc>\<projectName>\targe"t

### Jenkins and plugins versions report

Environment

```text
Paste the output here
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### What Operating System are you using (both controller, and any agents involved in the problem)?

MS Windows 11

### Reproduction steps

Use FSTrigger folder path as "%JENKINS_HOME%\\\target" to trigger a build on poll base

But working if we give full path like D:\Jenkins\\\target

**D:\Jenkins** is the jenkins location

### Expected Results

it should work for "%JENKINS_HOME%\\\target"

### Actual Results

Not working when i ues FSTrigger folder path as "%JENKINS_HOME%\\\target"

### Anything else?

_No response_

Start by reproducing the FSTrigger folder polling configuration on Windows 11, comparing the %JENKINS_HOME% path with the equivalent direct path. Check how the plugin resolves the configured folder and verify the trigger works with the environment-variable form while preserving direct-path behavior.

Written by the indexing model from the issue text.