feat: enable global TGW support

[Beilmann]

Description

Support user to toggle global transit gateway from variables

Release required?

• [ ] No release
• [ ] Patch release (x.x.X)
• [x] Minor release (x.X.x)
• [ ] Major release (X.x.x)

Release notes content

Run the pipeline

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Run the CI pipeline when the PR is ready for review and you expect tests to pass. Add a comment to the PR with the following text:

/run pipeline

Checklist for reviewers

• [ ] If relevant, a test for the change is included or updated with this PR.
• [ ] If relevant, documentation for the change is included or updated with this PR.

For mergers

• Use a conventional commit message to set the release level. Follow the guidelines.
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• Use the Squash and merge option.

[Beilmann]

/run pipeline

[surajsbharadwaj]

/run pipeline

[terraform-ibm-modules-ops]

:tada: This issue has been resolved in version 5.3.0 :tada:

The release is available on:

• GitHub release
• v5.3.0

Your semantic-release bot :package::rocket: