Add a sleep to reduce the likelihood of eventual consistency issue

[LujieZ]

Attempt to fix hashicorp/terraform-provider-google#17332.

Release Note Template for Downstream PRs (will be copied)

resourcemanager: added a 10s wait after `google_service_account_key` creation to attempt to mitigate eventual concistency issues resulting in a `Root resource was present, but now absent` error.

[github-actions]

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[rileykarson]

LGTM, will merge after tests assuming there are no big surprises (I don't expect any)

[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 ( 1 file changed, 6 insertions(+))
google-beta provider: Diff ( 1 file changed, 6 insertions(+))

[modular-magician]

Tests analytics

Total tests: 141
Passed tests: 111
Skipped tests: 30
Affected tests: 0

Click here to see the affected service packages

• resourcemanager

$\textcolor{green}{\textsf{All tests passed!}}$

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