Make defaultClientScopes publicly accessible

[jcanseco]

This patch makes the defaultClientScopes variable publicly accessible
to allow for code that depends on the provider to have the ability to
programmatically determine the default OAuth2 scopes used by the
provider, and to add to it if necessary.

Release Note Template for Downstream PRs (will be copied)

[modular-magician]

Hello! I am a robot who works on Magic Modules PRs.

I have detected that you are a community contributor, so your PR will be assigned to someone with a commit-bit on this repo for initial review.

Thanks for your contribution! A human will be with you soon.

@slevenick, please review this PR or find an appropriate assignee.

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 1 file changed, 2 insertions(+), 2 deletions(-))
Terraform Beta: Diff ( 1 file changed, 2 insertions(+), 2 deletions(-))
TF Conversion: Diff ( 1 file changed, 2 insertions(+), 2 deletions(-))

[modular-magician]

I have triggered VCR tests based on this PR's diffs. See the results here: "https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=135964"

[jcanseco]

The Cloud Build Trigger is failing, though it doesn't seem like I have permissions to view the results:

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 1 file changed, 2 insertions(+), 2 deletions(-))
Terraform Beta: Diff ( 1 file changed, 2 insertions(+), 2 deletions(-))
TF Conversion: Diff ( 1 file changed, 2 insertions(+), 2 deletions(-))

[modular-magician]

I have triggered VCR tests based on this PR's diffs. See the results here: "https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=135976"

[slevenick]

The Cloud Build Trigger is failing, though it doesn't seem like I have permissions to view the results:

Looks like it was a temporary CI issue. Amending the commit and re-pushing should fix it

[modular-magician]

I have triggered VCR tests in RECORDING mode for the following tests that failed during VCR: TestAccEndpointsService_basic|TestAccFolderIamAuditConfig_multiple You can view the result here: "https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=135980"

[jcanseco]

Thanks!