Added tests for isAppEngineRetryableError

[melinath]

Resolved hashicorp/terraform-provider-google#8333. Corrected typo in isAppEngineRetryableError that made it through the first PR (#4453) and added unit tests.

If this PR is for Terraform, I acknowledge that I have:

• Searched through the issue tracker for an open issue that this either resolves or contributes to, commented on it to claim it, and written "fixes {url}" or "part of {url}" in this PR description. If there were no relevant open issues, I opened one and commented that I would like to work on it (not necessary for very small changes).
• Generated Terraform, and ran make test and make lint to ensure it passes unit and linter tests.
• Ensured that all new fields I added that can be set by a user appear in at least one example (for generated resources) or third_party test (for handwritten resources or update tests).
• Ran relevant acceptance tests (If the acceptance tests do not yet pass or you are unable to run them, please let your reviewer know).
• Read the Release Notes Guide before writing my release note below.

Release Note Template for Downstream PRs (will be copied)

appengine: added retry for P4SA propagation delay

[modular-magician]

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

Diff report:

Terraform GA: Diff ( 2 files changed, 52 insertions(+), 1 deletion(-))
Terraform Beta: Diff ( 2 files changed, 52 insertions(+), 1 deletion(-))
TF Conversion: Diff ( 1 file changed, 1 insertion(+), 1 deletion(-))

[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=171139"

[melinath]

/gcbrun - last run failed for unrelated reasons.

[modular-magician]

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

Diff report:

Terraform GA: Diff ( 2 files changed, 52 insertions(+), 1 deletion(-))
Terraform Beta: Diff ( 2 files changed, 52 insertions(+), 1 deletion(-))
TF Conversion: Diff ( 1 file changed, 1 insertion(+), 1 deletion(-))

[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=171140"

[modular-magician]

I have triggered VCR tests in RECORDING mode for the following tests that failed during VCR: TestAccBigtableAppProfile_bigtableAppProfileSingleclusterExample|TestAccBigtableAppProfile_bigtableAppProfileMulticlusterExample You can view the result here: "https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=171150"

[c2thorn]

Thanks for the unit tests!