feature(vpn_gateway): update naming logic

[filipefigueredo]

Description

The main goal of this PR is to update vpn_gateway naming logic

PR Checklist

Please ensure the following before submitting this PR:

• [X] You complied with the code style of this project.
• [X] You formatted all Terraform configuration files to a canonical format (Hint: terraform fmt).
• [X] You validated all Terraform configuration files (Hint: terraform validate).
• [X] You executed a speculative plan, showing what actions Terraform would take to apply the current configuration (Hint: terraform plan).
• [X] The documentation was updated (README.md, CHANGELOG.md, etc.).
• [ ] Whenever possible, the dependencies were updated to the latest compatible versions.

PR Type

What kind of change does this PR introduce?

• [ ] Bugfix.
• [X] Feature
• [ ] Code style update (formatting, local variables)
• [X] Refactoring (no functional changes, no interface changes)
• [ ] Build related changes
• [ ] CI related changes
• [ ] Documentation content changes.
• [ ] Other... Please describe:

What is the new behavior?

How to test it

Does this PR introduce a breaking change?

• [ ] Yes.
• [X] No.

Other information

[github-actions[bot]]

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Pull Request Validation Report

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Pull request is a draft and should be ignored	✅	❌
Pull request is made by a whitelisted user and should be ignored	❌	❌
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Pull request is submitted by administrators and should be ignored	❌	❌

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Pull request does not satisfy any enabled whitelist criteria. Pull request will be validated.

Validation Report

Validation	Active	Result
All commits in this pull request come from verified users	❌	✅
All commits in this pull request has valid messages	❌	✅
Pull request does not introduce too many changes	❌	✅
Pull request has a valid title	✅	✅
Pull request has mentioned issues	❌	✅
Pull request has valid branch name	❌	✅
Pull request should have a non-empty body	✅	✅

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Pull request satisfies all enabled pull request rules.

[github-actions[bot]]

Pull Request Validation Report

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Whitelist Report

Whitelist	Active	Result
Pull request is a draft and should be ignored	✅	❌
Pull request is made by a whitelisted user and should be ignored	❌	❌
Pull request is submitted by a bot and should be ignored	❌	❌
Pull request is submitted by administrators and should be ignored	❌	❌

Result

Pull request does not satisfy any enabled whitelist criteria. Pull request will be validated.

Validation Report

Validation	Active	Result
All commits in this pull request come from verified users	❌	✅
All commits in this pull request has valid messages	❌	✅
Pull request does not introduce too many changes	❌	✅
Pull request has a valid title	✅	✅
Pull request has mentioned issues	❌	✅
Pull request has valid branch name	❌	✅
Pull request should have a non-empty body	✅	✅

Result

Pull request satisfies all enabled pull request rules.

[github-actions[bot]]

Pull Request Validation Report

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Whitelist Report

Whitelist	Active	Result
Pull request is a draft and should be ignored	✅	❌
Pull request is made by a whitelisted user and should be ignored	❌	❌
Pull request is submitted by a bot and should be ignored	❌	❌
Pull request is submitted by administrators and should be ignored	❌	❌

Result

Pull request does not satisfy any enabled whitelist criteria. Pull request will be validated.

Validation Report

Validation	Active	Result
All commits in this pull request come from verified users	❌	✅
All commits in this pull request has valid messages	❌	✅
Pull request does not introduce too many changes	❌	✅
Pull request has a valid title	✅	✅
Pull request has mentioned issues	❌	✅
Pull request has valid branch name	❌	✅
Pull request should have a non-empty body	✅	✅

Result

Pull request satisfies all enabled pull request rules.