fix: Use IPv6 CIDR block destination on route when IPv6 support is enabled

[Jarodiv]

Description

Make route creation use aws_route.destination_ipv6_cidr_block for attachments with ipv6_support set to true.

Motivation and Context

Creating routes for TGW attachments breaks the generally working support for IPv6 based setups.

• Resolves #101
• Resolves #112

Breaking Changes

There should be no negative effect on backwards compatibility with the current major version.

How Has This Been Tested?

• [ ] I have updated at least one of the examples/* to demonstrate and validate my change(s)
• [ ] I have tested and validated these changes using one or more of the provided examples/* projects
• [x] I have executed pre-commit run -a on my pull request

[github-actions[bot]]

This PR has been automatically marked as stale because it has been open 30 days with no activity. Remove stale label or comment or this PR will be closed in 10 days

[Jarodiv]

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[github-actions[bot]]

This PR has been automatically marked as stale because it has been open 30 days with no activity. Remove stale label or comment or this PR will be closed in 10 days

[Jarodiv]

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[github-actions[bot]]

This PR has been automatically marked as stale because it has been open 30 days with no activity. Remove stale label or comment or this PR will be closed in 10 days

[Jarodiv]

"Keep alive" post

[github-actions[bot]]

This PR has been automatically marked as stale because it has been open 30 days with no activity. Remove stale label or comment or this PR will be closed in 10 days

[Jarodiv]

"Keep alive" post"Keep alive" post

[github-actions[bot]]

This PR has been automatically marked as stale because it has been open 30 days with no activity. Remove stale label or comment or this PR will be closed in 10 days

[Jarodiv]

"Keep alive" post

[github-actions[bot]]

This PR has been automatically marked as stale because it has been open 30 days with no activity. Remove stale label or comment or this PR will be closed in 10 days

[Jarodiv]

"Keep alive" post

[github-actions[bot]]

This PR has been automatically marked as stale because it has been open 30 days with no activity. Remove stale label or comment or this PR will be closed in 10 days

[Jarodiv]

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[antonbabenko]

This PR is included in version 2.12.1 :tada:

[github-actions[bot]]

I'm going to lock this pull request because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues. If you have found a problem that seems related to this change, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.