Update grailsw scripts and grails-wrapper.jar

[jamesfredley]

This PR is the quick update of the grails wrapper scripts and jar which have historically been committed to source code, so that start.grails.org will generate a correct grails application for 7.0.0-SNAPSHOT, in the interim based on the build from https://github.com/apache/grails-core/tree/7.0.x/grails-wrapper

After merge, https://github.com/apache/grails-forge/actions/workflows/next-gcp-deploy.yml will be rerun to deploy the changes for 7.0.0-SNAPSHOT.

These files will later be replaced as part of: https://lists.apache.org/thread/sd0vntrsdlmqn8nnnwpjzbh4fl80sybg

#572

[Copilot]

Pull Request Overview

This PR updates the grailsw scripts for Windows and POSIX to generate a correct Grails 7.0.0-SNAPSHOT application. Key changes include updating error handling and control flow in the Windows batch file and migrating the Unix script from Bash to a minimal POSIX-compatible shell.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
grails-forge-core/src/main/resources/grails-wrapper/grailsw.bat	Adjustments in error redirection, control flow labels, and JVM options configuration
grails-forge-core/src/main/resources/grails-wrapper/grailsw	Replacement of the Bash shebang and restructuring of the Unix script for improved POSIX compliance

Comments suppressed due to low confidence (3)

grails-forge-core/src/main/resources/grails-wrapper/grailsw:1

• Changing the shebang from '#!/usr/bin/env bash' to '#!/bin/sh' requires ensuring that no Bash-specific features remain; verify that all shell constructs are fully POSIX-compliant.

#!/bin/sh

grails-forge-core/src/main/resources/grails-wrapper/grailsw.bat:29

• The control flow change from 'goto init' to 'goto execute' alters the initialization sequence; please confirm that the necessary initialization steps are still performed as expected.

if %ERRORLEVEL% equ 0 goto execute

grails-forge-core/src/main/resources/grails-wrapper/grailsw:128

• [nitpick] Using shell commands stored in 'cygwin', 'darwin', and 'nonstop' for boolean evaluation is clever; please verify that these variables reliably contain the commands 'true' or 'false' to maintain consistency across different POSIX shells.

if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then