Add persistence_iam_identity to Redis Instance

[upodroid]

Fixes hashicorp/terraform-provider-google#6850 . I also updated all the examples to use Redis 4.0 as it is the default one Google creates now.

Release Note Template for Downstream PRs (will be copied)

redis: added `persistence_iam_identity` output field to `google_redis_instance`

redis: explicitly noted in `google_redis_instance` documentation that `"REDIS_5_0"` is supported

[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.

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@rileykarson, 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 ( 3 files changed, 42 insertions(+), 6 deletions(-))
Terraform Beta: Diff ( 3 files changed, 42 insertions(+), 6 deletions(-))
Ansible: Diff ( 2 files changed, 26 insertions(+), 6 deletions(-))
TF OiCS: Diff ( 2 files changed, 3 insertions(+), 3 deletions(-))
Inspec: Diff ( 4 files changed, 8 insertions(+), 1 deletion(-))

[rileykarson]

Thanks!

LGTM- thanks for contributing @upodroid!

I'll merge once our CI has run. It's unlikely to fail- I'll comment again in the unlikely scenarios that I need anything else from you.

[modular-magician]

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

Diff report:

Terraform GA: Diff ( 3 files changed, 29 insertions(+), 6 deletions(-))
Terraform Beta: Diff ( 3 files changed, 29 insertions(+), 6 deletions(-))
Ansible: Diff ( 2 files changed, 26 insertions(+), 6 deletions(-))
TF OiCS: Diff ( 2 files changed, 3 insertions(+), 3 deletions(-))
Inspec: Diff ( 4 files changed, 8 insertions(+), 1 deletion(-))