chore(source-google-ads): add feature-deprecations and OAuth external documentation URLs

[devin-ai-integration]

What

Adds two missing externalDocumentationUrls entries to source-google-ads/metadata.yaml. No URLs were stale — all four existing entries returned HTTP 200.

Google tracks unversioned feature deprecations on a page separate from the version sunset timetable, and that page was not registered in the connector metadata. It is where the 37-month data retention change, the call-only ads removal, and the Smart Campaigns deprecation were published — all of which were only discoverable via the developer blog during this deprecation sweep.

+ - title: Feature deprecations and unversioned changes
+   url: https://developers.google.com/google-ads/api/docs/deprecations
+   type: api_deprecations
+ - title: OAuth2 authentication overview
+   url: https://developers.google.com/google-ads/api/docs/oauth/overview
+   type: authentication_guide

The authentication_guide entry is added so future OAuth-policy checks (MFA, passkeys) have a registered source.

Resolves https://github.com/airbytehq/oncall/issues/13219

• https://github.com/airbytehq/oncall/issues/13219

Related (not closed by this PR): airbytehq/oncall#13216 (passkey authentication requirement), airbytehq/oncall#12907 (v23 sunset)

Requested by Danylo Jablonski (gl_danylo.jablonski@airbyte.io) via the API Deprecation Monitoring playbook for the google-ads API family.

How

Metadata-only edit. No connector version bump — externalDocumentationUrls does not affect the published image, consistent with #82265 and #83262.

Review guide

1. airbyte-integrations/connectors/source-google-ads/metadata.yaml

User Impact

None. Documentation metadata only.

Can this PR be safely reverted and rolled back?

• YES 💚
• NO ❌

Link to Devin session: https://app.devin.ai/sessions/8315fd4b5036469585c5ef3e475641aa

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Note

Autopilot progressive rollouts are not enabled for the following modified connector(s):

• source-google-ads

This is a courtesy heads-up only — it does not block merge or fail any check.
To enable automatic progressive rollouts for the connector(s) above, comment
/enable-autopilot-rollouts on this PR. This sets defaultRolloutMode: autopilot
and enableProgressiveRollout: true in each connector's metadata.yaml,
preserving any existing autopilotConfig.

[github-actions]

source-google-ads Connector Test Results

337 tests   333 ✅  54m 17s ⏱️
  2 suites    4 💤
  2 files      0 ❌

Results for commit 661121e.