RFR: 8353489: Increase Timeout and Improve Windows Compatibility in Basic.java Test

[Oleksii Sylichenko]

This PR proposes three improvements to the `Basic.java` test:

1. Increase Timeout
   - The current timeout is insufficient when running the test in IntelliJ IDEA.
   - I propose increasing it by one minute.
   - The timeout value was last modified on May 13, 2010 (commit [56131863a71c](https://github.com/openjdk/jdk/commit/56131863a71ca552d0a881364bd2b3581e13f058)) and has remained unchanged since then.

2. Fix Incompatibility with Windows (Cygwin vs. Native)
    - One of the tests executes the `echo` command.
    - This works in Cygwin but fails when running the test in a pure Windows environment (e.g., IntelliJ IDEA).
    - I propose replacing echo with `cmd /c echo.`, which produces the same output (a single newline) in Windows, ensuring compatibility.

3. Prevent Autorun Scripts in the `cmd /c set` Command
    - The test runs `cmd /c set`, but in Windows, this may trigger autorun scripts.
    - I propose adding the `/d` options to prevent autorun scripts from affecting the test results.

These changes improve test reliability and ensure compatibility across different environments.
Testing:
- Verified that the test runs successfully in IntelliJ IDEA without timeout issues.
- Confirmed that `cmd /c echo.` produces the expected output in Windows.
- Ensured that `cmd /d /c set` correctly lists environment variables without executing autorun scripts.

# Detailed Description

## echo
The following test fails in a clean Windows environment (e.g., when run from IntelliJ IDEA without Cygwin):

//----------------------------------------------------------------
// Test Runtime.exec(...envp...) with envstrings without any `='
//----------------------------------------------------------------

with following error:

Cannot run program "echo": CreateProcess error=2, The system cannot find the file specified


## cmd.exe /c set
 The following test fails in a Windows environment under specific conditions:

//----------------------------------------------------------------
// Test Runtime.exec(...envp...)
// Check for sort order of environment variables on Windows.
//----------------------------------------------------------------

with following error:

>'+=+
BAZ=GORP
CONDA_BAT=C:\.......\\miniconda3\\condabin\\conda.bat
CONDA_EXE=C:\........\\miniconda3\\Scripts\\conda.exe
CONDA_SHLVL=0
FOO=BAR
PATH=C:\.........\\miniconda3\\condabin;
QUUX=
SystemRoot=C:\\WINDOWS
_=_
~=~
'< not equal to '+=+
BAZ=GORP
FOO=BAR
QUUX=
SystemRoot=C:\\WINDOWS
_=_
~=~
'


**Reason**
In my environment, Miniconda was installed, which adds a script execution to the **autorun** of `cmd`. This script sets additional environment variables that break this test.  

To reproduce this bug, you can manually add a custom script to the autorun. I have described the steps in detail in my article: [AutoRun for Windows Command Processor (cmd.exe)](https://www.linkedin.com/pulse/autorun-windows-command-processor-cmdexe-oleksii-sylichenko-fofif).

## Changes

- increase timeout by one minute
- remove unused import

**For Windows**
- add `/d` to `winEnvCommand` - to disable the execution of AutoRun commands
- replace `echo` with `cmd /c echo.`

-------------

Commit messages:
 - Basic.java:

Changes: https://git.openjdk.org/jdk/pull/23933/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23933&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8353489
  Stats: 6 lines in 1 file changed: 0 ins; 1 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/23933.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23933/head:pull/23933

PR: https://git.openjdk.org/jdk/pull/23933