Windows container started by the plugin shows values of WORKSPACE and WORKSPACE_TMP environment variables in Linux format

### Jenkins and plugins versions report

Environment

```text
Jenkins: 2.462.3
OS: Linux - 5.15.0-301.163.5.2.el9uek.x86_64
Java: 11.0.25 - Red Hat, Inc. (OpenJDK 64-Bit Server VM)
---
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Parameterized-Remote-Trigger:3.2.0
allure-jenkins-plugin:2.31.1
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apache-httpcomponents-client-4-api:4.5.14-208.v438351942757
apache-httpcomponents-client-5-api:5.4-124.v31e2987e48f4
appaloosa-plugin:1.4.12
asm-api:9.7.1-97.v4cc844130d97
atlassian-bitbucket-server-integration:4.1.1
authentication-tokens:1.119.v50285141b_7e1
authorize-project:1.8.1
azure-ad:531.v13107da_f2635
azure-credentials:312.v0f3973cd1e59
azure-sdk:184.v1f2c161c9777
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workflow-multibranch:795.ve0cb_1f45ca_9a_
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workflow-step-api:678.v3ee58b_469476
workflow-support:932.vb_555de1b_a_b_94
ws-cleanup:0.47
xtrigger-api:1.0
xunit:3.1.5

```

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

Controller: Oracle Linux 9
Agents: Windows Server 2019

### Reproduction steps

1. Create a Docker agent template on a Windows Docker host
2. Use a Docker image in which _NO working directory is explicitly set_. The default is C:\
3. Run a build job using the label defined in the above template.
4. In the build job, execute the command 'set' to list all environment variables.

This behavior breaks some build jobs.

### Expected Results


### Actual Results


### Anything else?

Btw. If the Docker container comes with a Dockerfile having
WORKDIR C:\Users\ContainerAdministrator
inside, then the issue does not appear.

### Are you interested in contributing a fix?

_No response_