Terraform SDK upgrade to latest

[matpimenta]

This PR updates the following:

• Terraform SDK to latest (v2.23.0) along side Golang (1.19) and other dependencies (see go.mod).
• Changes the documentation and acceptance tests to use Terraform's recommended syntax
• Run acceptance tests in parallel to reduce the total running time

[matpimenta]

Acceptance Test Results

``` --- PASS: TestUserAgent (0.00s) --- PASS: TestProvider (0.00s) --- PASS: TestFlattenInterfaces (0.00s) --- PASS: TestFlattenPublishedServices (0.00s) --- PASS: TestFlattenDisks (0.00s) --- PASS: TestValidateNICType (0.00s) --- PASS: TestValidateRoleType (0.00s) --- PASS: TestValidateNoSubString (0.00s) --- PASS: TestValidateNoStartWith (0.00s) --- PASS: TestAccSkytapVMCPURAM_Invalid (0.19s) --- PASS: TestAccSkytapProject_Basic (5.20s) --- PASS: TestAccDataSourceSkytapProject_Basic (108.52s) --- PASS: TestAccSkytapEnvironment_UserData (130.63s) --- PASS: TestAccSkytapProject_AddEnvironment (146.01s) --- PASS: TestAccSkytapEnvironment_DisableInternetConflict (0.11s) --- PASS: TestAccSkytapVMCPU_OutOfRange (171.50s) --- PASS: TestAccSkytapNetwork_Update (171.50s) --- PASS: TestAccSkytapNetwork_Basic (151.36s) --- PASS: TestAccSkytapLabelCategory_Duplicated (3.54s) --- PASS: TestAccSkytapVM_Basic (285.21s) --- PASS: TestAccSkytapEnvironment_Labels (129.93s) --- PASS: TestAccSkytapLabelICNR_Basic (171.36s) --- PASS: TestAccSkytapEnvironment_LabelsUpdate (164.53s) --- PASS: TestAccSkytapEnvironment_UserDataUpdate (147.27s) --- PASS: TestAccSkytapEnvironment_UpdateTags (145.02s) --- PASS: TestAccSkytapVMCPU_DiskIntact (442.97s) --- PASS: TestAccSkytapLabelCategory_Basic (2.70s) --- PASS: TestAccSkytapLabelCategory_MultiValueBasic (3.29s) --- PASS: TestAccSkytapLabelCategory_Update (4.40s) --- PASS: TestAccSkytapEnvironment_Basic (180.84s) --- PASS: TestAccSkytapEnvironment_UpdateTemplate (215.27s) --- PASS: TestAccSkytapEnvironment_Update (267.38s) --- PASS: TestAccSkytapVM_Typical (594.01s) --- PASS: TestAccSkytapVM_Labels (268.05s) --- PASS: TestAccSkytapVM_UserData (278.29s) --- PASS: TestAccSkytapVMDisk_Invalid (0.15s) --- PASS: TestAccSkytapVMDisk_OS (402.53s) --- PASS: TestAccSkytapVM_Update (455.75s) --- PASS: TestAccSkytapVMDisk_OSChangeAfter (436.25s) --- PASS: TestAccDataSourceSkytapTemplate_RegexMostRecent (5.00s) --- PASS: TestAccDataSourceSkytapTemplate_Basic (4.67s) --- PASS: TestAccSkytapVMCPU_OutOfRangeAfterUpdate (194.98s) --- PASS: TestAccSkytapVM_Interface (805.58s) --- PASS: TestAccSkytapVMDisks_UpdateNPECheck (431.89s) --- PASS: TestAccSkytapVMDisks_Resize (439.74s) --- PASS: TestAccSkytapVM_Concurrent (722.96s) --- PASS: TestAccSkytapVMDisks_Create (497.37s) --- PASS: TestAccSkytapVM_PublishedService (1071.47s) --- PASS: TestResponseErrorIsNotFound_BadRequest (0.00s) --- PASS: TestResponseErrorIsNotFound_NotFound (0.00s) --- PASS: TestString (0.00s) --- PASS: TestInt (0.00s) --- PASS: TestNetworkType (0.00s) --- PASS: TestRunstate (0.00s) --- PASS: TestBool (0.00s) --- PASS: TestAccSkytapVM_Timeout (239.87s) --- PASS: TestAccExternalPorts (391.91s) --- PASS: TestAccSkytapVMCPURam_Create (787.39s) --- PASS: TestAccSkytapVM_PublishedServiceBadNic (208.68s) --- PASS: TestAccSkytapVMCPURAM_UpdateNPECheck (408.61s) ```