Refactor tests

[kevinwcyu]

Work from this comment #179 (comment)

Sample PR: #190

Test files

• pkg/resource/caching_resource_provider_test.go
• pkg/server/test/describe_asset_model_test.go
• pkg/server/test/describe_asset_test.go
• pkg/server/test/list_asset_models_test.go
• pkg/server/test/list_assets_test.go
• pkg/server/test/list_associated_assets_test.go
• pkg/server/test/property_value_history_test.go
• pkg/server/test/property_values_for_time_range_test.go

Once test files are refactored, the following helpers, test data can be removed as they won't be used anymore

• pkg/sitewise/api/test_data_test.go
• pkg/testdata

Tasks

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[fridgepoet]

If it's clear to you which tests remain to be refactored, would you add a checklist or something?

[katebrenner]

closing as not planned