Upgraded App Configuration go admin SDK to latest version, Replaced plain fmt error function with flex error function

[prajwal-jarali]

PR Details:-

• App Configuration go admin SDK is upgraded to 0.4.4 version which is generated by openai-sdkgen from latest api-spec file.
• As requested by Terraform team all plain fmt error functions are now replaced with flex fmtError function for better readable error messages.
• Environment test file is now made to use lite plan instead of standard plan as test can be completed in lite plan only.
• Segments test cases which were expecting first and last attribute in response are removed as terraform doesn't include them in response.
• Simple Href is now replaced with first, last, next, previous types in the respective place-holders

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Relates OR Closes #0000

Output from acceptance testing:

1. make build

prajwaljarali@Prajwals-MacBook-Pro terraform-provider-ibm % make build
==> Checking that code complies with gofmt requirements...
go vet .
go install

2. Individual tests->

=== RUN   TestAccIbmAppConfigCollectionDataSource
--- PASS: TestAccIbmAppConfigCollectionDataSource (61.87s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/appconfiguration        63.182s

=== RUN   TestAccIbmAppConfigCollectionsDataSource
--- PASS: TestAccIbmAppConfigCollectionsDataSource (61.08s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/appconfiguration        62.386s

=== RUN   TestAccIbmAppConfigEnvironmentDataSourceBasic
--- PASS: TestAccIbmAppConfigEnvironmentDataSourceBasic (69.63s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/appconfiguration        71.162s

=== RUN   TestAccIbmAppConfigEnvironmentsDataSourceBasic
--- PASS: TestAccIbmAppConfigEnvironmentsDataSourceBasic (27.04s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/appconfiguration        28.668s

=== RUN   TestAccIbmAppConfigFeatureDataSource
--- PASS: TestAccIbmAppConfigFeatureDataSource (73.92s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/appconfiguration        75.219s

=== RUN   TestAccIbmAppConfigFeaturesDataSourceBasic
--- PASS: TestAccIbmAppConfigFeaturesDataSourceBasic (65.63s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/appconfiguration        67.161s

=== RUN   TestAccIbmAppConfigPropertyDataSource
collectionscollectionscollectionscollections--- PASS: TestAccIbmAppConfigPropertyDataSource (61.82s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/appconfiguration        63.390s

=== RUN   TestAccIbmAppConfigPropertiesDataSourceBasic
--- PASS: TestAccIbmAppConfigPropertiesDataSourceBasic (68.35s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/appconfiguration        69.643s

=== RUN   TestAccIbmAppConfigSegmentDataSource
--- PASS: TestAccIbmAppConfigSegmentDataSource (58.24s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/appconfiguration        59.504s

=== RUN   TestAccIbmAppConfigSegmentsDataSourceBasic
--- PASS: TestAccIbmAppConfigSegmentsDataSourceBasic (59.99s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/appconfiguration        61.995s

=== RUN   TestAccIbmAppConfigEnvironmentBasic
--- PASS: TestAccIbmAppConfigEnvironmentBasic (74.50s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/appconfiguration        76.115s

=== RUN   TestAccIbmIbmAppConfigFeatureBasic
--- PASS: TestAccIbmIbmAppConfigFeatureBasic (77.32s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/appconfiguration        78.830s

=== RUN   TestAccIbmIbmAppConfigCollectionBasic
--- PASS: TestAccIbmIbmAppConfigCollectionBasic (71.60s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/appconfiguration        72.916s

=== RUN   TestAccIbmIbmAppConfigPropertyBasic
--- PASS: TestAccIbmIbmAppConfigPropertyBasic (77.27s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/appconfiguration        78.573s

=== RUN   TestAccIbmIbmAppConfigSegmentBasic
--- PASS: TestAccIbmIbmAppConfigSegmentBasic (75.98s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/appconfiguration        77.236s