feat(dlp): Add code sample for using REP endpoint

[jakubrauch]

Description

Fixes: N/A

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Checklist

• [x] I have followed Contributing Guidelines from CONTRIBUTING.MD
• [x] Tests pass: go test -v ./.. (see Testing)
• [x] Code formatted: gofmt (see Formatting)
• [x] 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
• [x] Please merge this PR for me once it is approved

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 1 region tag.

- [dlp/snippets/inspect/inspect_string_rep.go:17](https://github.com/jakubrauch/golang-samples/blob/0cacbad594497ed37e5d0f7c9e8b45e727607c74/dlp/snippets/inspect/inspect_string_rep.go#L17), tag `dlp_inspect_string_rep`

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[conventional-commit-lint-gcf[bot]]

🤖 I detect that the PR title and the commit message differ and there's only one commit. To use the PR title for the commit history, you can use Github's automerge feature with squashing, or use automerge label. Good luck human!

-- conventional-commit-lint bot https://conventionalcommits.org/

[jakubrauch]

This looks like it will need to go into a separate directory.

Why?

Is this a new feature or a new version of the API?

No changes to the API, this just shows how to use the same API through dlp..rep.googleapis.com instead of dlp.googleapis.com. Same functionality, but provides in-transit regionalization.

It's effectively the same sample as https://github.com/GoogleCloudPlatform/golang-samples/blob/main/dlp/snippets/inspect/inspect_string.go except for adding repLocation and the regional endpoint.

Correct.

[jakubrauch]

Thanks, updated, ptal