[BUG] ignore file pattern **/* does not suppress generation of all files in root of output directory

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

The pattern **/* in .openapi-generator-ignore file should suppress all content in the root of the output directory. It does not and you need to add an additional pattern /* to get the root output directory files suppressed.

This is flagged/warned as redundant by .ignore file tooling.

openapi-generator version

7.0.1

OpenAPI declaration file content or url

.openapi-generator-ignore

**/*

Generation Details

In this case I was using the java generation.

Steps to reproduce

1. Create an ignore file with the content mentioned above
2. Generate an openapi spec using java defaults

Expected: No files generated at all
Actual: All files in the root directory are generated.

Related issues/PRs

None that I can see

Suggest a fix

No suggestion

Start by reproducing Java generation with a .openapi-generator-ignore file containing only **/*, using the issue's expected and actual results as the baseline. Trace the ignore handling used during generation and verify that no files are produced in the output directory when the behavior is corrected.