test: Fix missed instance type cache assignment

[jonathan-innis]

Fixes #N/A

Description

Fix missed instanceTypeCache assignment in test.Environment

How was this change tested?

make presubmit

Does this change impact docs?

• Yes, PR includes docs updates
• Yes, issue opened: #
• No

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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[coveralls]

Pull Request Test Coverage Report for Build 11028795321

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.02%) to 83.008%

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Totals
Change from base Build 11025546705:	0.02%
Covered Lines:	5520
Relevant Lines:	6650

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💛 - Coveralls

[engedaam]

LGTM 🚀