biglake_iceberg_table: Add sleep to test

[rambleraptor]

Test only change for vended credentials. We should have a 60s sleep, since the service account isn't necessarily ready.

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- Test only

[github-actions]

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[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes for commit e702093:

Diff report

Your PR generated the following diffs in downstream repositories:

Repository	Diff Link	Changes
google provider	View Diff	1 file changed, 14 insertions(+), 1 deletion(-)
google-beta provider	View Diff	1 file changed, 14 insertions(+), 1 deletion(-)

Test report

Analytics

Total Tests	Passed	Skipped	Affected
21	20	1	0

Affected Service Packages

• biglakeiceberg

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@rambleraptor, @melinath, @sachinpro VCR tests complete for e702093!