Allow AUTH_TYPE_UNSPECIFIED in auth config for connection

[kanav-google]

Some connectors have auth types which are not among standard ones like Private App Token in Hubspot. These are introduced as part of auth type unspecified and the additional variables.

integrationconnectors: allowed `AUTH_TYPE_UNSPECIFIED` option in `google_integration_connectors_connection` resource to support non-standard auth types

[github-actions]

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[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

google provider: Diff ( 2 files changed, 3 insertions(+), 3 deletions(-))
google-beta provider: Diff ( 2 files changed, 3 insertions(+), 3 deletions(-))

[modular-magician]

Tests analytics

Total tests: 5
Passed tests: 3
Skipped tests: 2
Affected tests: 0

Click here to see the affected service packages

• integrationconnectors

🟢 All tests passed!

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[roaks3]

Note this is intended to fix b/384477234 and b/380393940