Fix provider configuration code to handle Unknown values correctly

[SarahFrench]

Fixes hashicorp/terraform-provider-google#14444

Related to #8798

Release Note Template for Downstream PRs (will be copied)

provider: addressed a bug where configuring the provider with unknown values did not behave as expected

[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.

Terraform GA: Diff ( 3 files changed, 230 insertions(+), 183 deletions(-))
Terraform Beta: Diff ( 3 files changed, 230 insertions(+), 183 deletions(-))

[modular-magician]

Tests analytics

Total tests: 3037
Passed tests 2736
Skipped tests: 297
Affected tests: 4

Action taken

Found 4 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit. Click here to see the affected tests

TestAccMonitoringMonitoredProject_monitoringMonitoredProjectLongFormExample|TestAccMonitoringMonitoredProject_projectNumShortForm|TestAccMonitoringMonitoredProject_projectNumLongForm|TestAccMonitoringMonitoredProject_monitoringMonitoredProjectBasicExample

Get to know how VCR tests work

[modular-magician]

$\textcolor{green}{\textsf{Tests passed during RECORDING mode:}}$
TestAccMonitoringMonitoredProject_monitoringMonitoredProjectLongFormExample[Debug log]
TestAccMonitoringMonitoredProject_projectNumShortForm[Debug log]
TestAccMonitoringMonitoredProject_projectNumLongForm[Debug log]
TestAccMonitoringMonitoredProject_monitoringMonitoredProjectBasicExample[Debug log]

Rerun these tests in REPLAYING mode to catch issues

$\textcolor{green}{\textsf{No issues found for passed tests after REPLAYING rerun.}}$

---

$\textcolor{green}{\textsf{All tests passed!}}$
View the build log or the debug log for each test

[SarahFrench]

I've yet to manually test this change to see if this use case from the original issue works as expected again:

provider "google-beta" {
  project     = "foo"
  credentials = base64decode(google_service_account_key.terraform_service_account.private_key)
}

[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.

Terraform GA: Diff ( 2 files changed, 227 insertions(+), 175 deletions(-))
Terraform Beta: Diff ( 2 files changed, 227 insertions(+), 175 deletions(-))

[modular-magician]

Tests analytics

Total tests: 3044
Passed tests 2745
Skipped tests: 298
Affected tests: 1

Action taken

Found 1 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit. Click here to see the affected tests

TestAccDataSourceGoogleServiceAccountIdToken_impersonation

Get to know how VCR tests work

[modular-magician]

$\textcolor{green}{\textsf{Tests passed during RECORDING mode:}}$
TestAccDataSourceGoogleServiceAccountIdToken_impersonation[Debug log]

Rerun these tests in REPLAYING mode to catch issues

$\textcolor{green}{\textsf{No issues found for passed tests after REPLAYING rerun.}}$

---

$\textcolor{green}{\textsf{All tests passed!}}$
View the build log or the debug log for each test

[SarahFrench]

I manually tested the use case from the original issue (see comment) and I've added a non-VCR acceptance test that asserts the provider's behaviour.

I've tried to implement that test in a way so it uses the code in the repo (instead of downloading from the Terraform Registry) but kept hitting issues. The above is good enough for now I think.

[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.

Terraform GA: Diff ( 3 files changed, 378 insertions(+), 175 deletions(-))
Terraform Beta: Diff ( 3 files changed, 378 insertions(+), 175 deletions(-))

[modular-magician]

Tests analytics

Total tests: 3070
Passed tests 2770
Skipped tests: 300
Affected tests: 0

$\textcolor{green}{\textsf{All tests passed in REPLAYING mode.}}$
View the build log