feat(auth): samples for auth

[FrodoTheTrue]

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[snippet-bot]

Here is the summary of changes.

You are about to add 6 region tags.

• auth/authenticateExplicit.js:19, tag auth_cloud_explicit_adc
• auth/authenticateImplicitWithAdc.js:21, tag auth_cloud_implicit_adc
• auth/idTokenFromImpersonatedCredentials.js:29, tag auth_cloud_idtoken_impersonated_credentials
• auth/idTokenFromMetadataServer.js:22, tag auth_cloud_idtoken_metadata_server
• auth/idTokenFromServiceAccount.js:23, tag auth_cloud_idtoken_service_account
• auth/verifyGoogleIdToken.js:27, tag auth_cloud_verify_google_idtoken

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[grayside]

Is this PR migrating samples from https://github.com/googleapis/google-auth-library-nodejs/tree/main/samples? If so could we follow the revised process to keep the Git commit history?

[rsamborski]

@Shnatsel Can you PTAL and get this merged?
@Sita04 can provide more context

[ace-n]

Highlighting @grayside's comment:

Is this PR migrating samples from https://github.com/googleapis/google-auth-library-nodejs/tree/main/samples? If so could we follow the revised process to keep the Git commit history?

@FrodoTheTrue FYI: it's probably easiest to close this PR and create a new one.

(Feel free to DM me internally or post in the (internal) migration chat channel if any of this is unclear! 😃)

[Shnatsel]

The samples have instead been added to the client library repository. Since the client library is not automatically generated, there are currently no plans to move the samples to nodejs-docs-samples. Closing.