chore: change the prompt of pax extension in configure help

[gongxun0928]

The --enable-pax configuration option defaults to 'yes'.
so in the default help information, we need to display the '--disable-pax' option

Fixes #ISSUE_Number

What does this PR do?

Type of Change

• Bug fix (non-breaking change)
• New feature (non-breaking change)
• Breaking change (fix or feature with breaking changes)
• Documentation update

Breaking Changes

Test Plan

• Unit tests added/updated
• Integration tests added/updated
• Passed make installcheck
• Passed make -C src/test installcheck-cbdb-parallel

Impact

Performance:

User-facing changes:

Dependencies:

Checklist

• Followed contribution guide
• Added/updated documentation
• Reviewed code for security implications
• Requested review from cloudberry committers

Additional Context

CI Skip Instructions

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[tuhaihe]

IMO, as a contrib extension, that would be better to disable it by default.

However, we already use the --enable-pax option in some files, could you help update them together, including:

• https://github.com/apache/cloudberry/blob/main/.github/workflows/coverity.yml
• https://github.com/apache/cloudberry/blob/main/.github/workflows/sonarqube.yml

Thanks.

Moreover, welcome to update your commit title by following the template.

[tuhaihe]

Hi, I started a discussion on changing PAX plugin to be disabled by default: https://lists.apache.org/thread/q1n7hztzzydk1owhn73tc1b4chyhzx85