Ensure Omnibus GitLab gems are recompiled for older platforms

What does this MR do?

This merge request does two things:

1. Ensure Omnibus GitLab gems are recompiled for older platforms

The ffi gem just released a precompiled gem for aarch64-linux-musl, which is built with Ubuntu 20.04 with glibc 2.27. As a result, older systems, such as Amazon Linux 2, need to enable force_ruby_platform true to ensure any native gems continue to work. This will be needed if the ffi gem is updated to 1.17.0.

2. Updates the ffi gem to 1.17.0.

This fixes a number of issues (https://my.diffend.io/gems/ffi/1.16.3/1.17.0), and will validate that this gem avoids precompiled gems on systems with older glibc versions.

Related issues

Relates to #8570

Checklist

See Definition of done.

For anything in this list which will not be completed, please provide a reason in the MR discussion.

Required

• MR title and description are up to date, accurate, and descriptive.
• MR targeting the appropriate branch.
• Latest Merge Result pipeline is green.
• When ready for review, MR is labeled "~workflow::ready for review" per the Distribution MR workflow.

For GitLab team members

If you don't have access to this, the reviewer should trigger these jobs for you during the review process.

• The manual Trigger:ee-package jobs have a green pipeline running against latest commit.
• If config/software or config/patches directories are changed, make sure the build-package-on-all-os job within the Trigger:ee-package downstream pipeline succeeded.
• If you are changing anything SSL related, then the Trigger:package:fips manual job within the Trigger:ee-package downstream pipeline must succeed.
• If CI configuration is changed, the branch must be pushed to dev.gitlab.org to confirm regular branch builds aren't broken.

Expected (please provide an explanation if not completing)

• Test plan indicating conditions for success has been posted and passes.
• Documentation created/updated.
• Tests added.
• Integration tests added to GitLab QA.
• Equivalent MR/issue for the GitLab Chart opened.
• Validate potential values for new configuration settings. Formats such as integer 10, duration 10s, URI scheme://user:passwd@host:port may require quotation or other special handling when rendered in a template and written to a configuration file.