feat: add samples for labels, regional SM

[vipul7499]

Description

Fixes #

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Checklist

• [ ] I have followed Contributing Guidelines from CONTRIBUTING.MD
• [ ] Tests pass: go test -v ./.. (see Testing)
• [ ] Code formatted: gofmt (see Formatting)
• [ ] Vetting pass: go vet (see Formatting)
• [ ] These samples need a new API enabled in testing projects to pass (let us know which ones)
• [ ] These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• [ ] This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• [ ] This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• [ ] Please merge this PR for me once it is approved

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 4 region tags.

- [secretmanager/regional_samples/create_regional_secret_with_labels.go:17](https://github.com/GoogleCloudPlatform/golang-samples/blob/27c24d78e08fa16fc935cd47a60a2d4b47d2d090/secretmanager/regional_samples/create_regional_secret_with_labels.go#L17), tag `secretmanager_create_regional_secret_with_labels` - [secretmanager/regional_samples/delete_regional_secret_label.go:17](https://github.com/GoogleCloudPlatform/golang-samples/blob/27c24d78e08fa16fc935cd47a60a2d4b47d2d090/secretmanager/regional_samples/delete_regional_secret_label.go#L17), tag `secretmanager_delete_regional_secret_label` - [secretmanager/regional_samples/edit_regional_secret_label.go:17](https://github.com/GoogleCloudPlatform/golang-samples/blob/27c24d78e08fa16fc935cd47a60a2d4b47d2d090/secretmanager/regional_samples/edit_regional_secret_label.go#L17), tag `secretmanager_create_update_regional_secret_label` - [secretmanager/regional_samples/view_regional_secret_labels.go:17](https://github.com/GoogleCloudPlatform/golang-samples/blob/27c24d78e08fa16fc935cd47a60a2d4b47d2d090/secretmanager/regional_samples/view_regional_secret_labels.go#L17), tag `secretmanager_view_regional_secret_labels`

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[telpirion]

Please move the tests so that they are in the same folder as the samples and change the samples to use camelCase. Thank you!

[vipul7499]

Please move the tests so that they are in the same folder as the samples and change the samples to use camelCase. Thank you!

Fixed