Relax boolean conversions to accept varying cases

[sethvargo]

Relax boolean conversions to DCL accept varying cases.

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orgpolicy: accepted variable cases for booleans such as true, True, and TRUE in `google_org_policy_policy`

[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.

Terraform GA: Diff ( 2 files changed, 92 insertions(+), 9 deletions(-))
Terraform Beta: Diff ( 2 files changed, 92 insertions(+), 9 deletions(-))
TF Validator: Diff ( 2 files changed, 3 insertions(+), 3 deletions(-))

[modular-magician]

Tests analytics

Total tests: 2552
Passed tests 2272
Skipped tests: 275
Affected tests: 5

Action taken

Found 5 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit. Click here to see the affected tests

TestAccFirebaserulesRelease_BasicRelease|TestAccDataSourceGoogleFirebaseAndroidAppConfig|TestAccComputeForwardingRule_update|TestAccApigeeKeystoresAliasesKeyCertFile_apigeeKeystoresAliasesKeyCertFileTestExample|TestAccApigeeEnvKeystoreAliasPkcs12_apigeeEnvKeystoreAliasPkcs12Example

Get to know how VCR tests work

[modular-magician]

Tests passed during RECORDING mode:
TestAccFirebaserulesRelease_BasicRelease[Debug log]
TestAccDataSourceGoogleFirebaseAndroidAppConfig[Debug log]
TestAccComputeForwardingRule_update[Debug log]
TestAccApigeeKeystoresAliasesKeyCertFile_apigeeKeystoresAliasesKeyCertFileTestExample[Debug log]
TestAccApigeeEnvKeystoreAliasPkcs12_apigeeEnvKeystoreAliasPkcs12Example[Debug log]

All tests passed
View the build log or the debug log for each test