DLP: Added sample for inspect string with exclusion dict

[dinesh-crest]

Added test cases for same

Description

Reference:- https://cloud.google.com/dlp/docs/creating-custom-infotypes-rules#omit_specific_email_address_from_email_address_detector_scan

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Checklist

• I have followed guidelines from CONTRIBUTING.MD and Samples Style Guide
• Tests pass: npm test (see Testing)
• Lint pass: npm run lint (see Style)
• 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 sample directory, and I created GitHub Actions workflow 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]

Here is the summary of changes.

You are about to add 1 region tag.

• dlp/inspectStringWithExclusionDict.js:24, tag dlp_inspect_string_with_exclusion_dict

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[annadata]

The documentation surrounding this sample says
Cloud DLP using an InspectConfig that it should avoid matching on "example@example.com" in a scan that uses the infoType detector EMAIL_ADDRESS:

The corresponding Java test has
assertThat(output).contains("gary@example.com");
assertThat(output).doesNotContain("example@example.com");
If you do the opposite here, the reader will be confused.

[pattishin]

Hi @dinesh-crest! Do you mind taking a look at the conflicts in dlp/system-test/inspect.test.js?

[annadata]

LGTM