fix: adjust validation for Code Engine application `scale_concurrency_target`

[michael-magrian]

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Relates OR Closes a bug that was reported through the customer product support.

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccIbmCodeEngineAppBasic'
...
=== RUN   TestAccIbmCodeEngineAppBasic
--- PASS: TestAccIbmCodeEngineAppBasic (152.98s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/codeengine      161.841s
...

$ make testacc TESTARGS='-run=TestAccIbmCodeEngineAppExtended'
...
=== RUN   TestAccIbmCodeEngineAppExtended
--- PASS: TestAccIbmCodeEngineAppExtended (156.58s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/codeengine      165.746s
...

$ make testacc TESTARGS='-run=TestAccIbmCodeEngineAppDataSourceBasic'
...
=== RUN   TestAccIbmCodeEngineAppDataSourceBasic
--- PASS: TestAccIbmCodeEngineAppDataSourceBasic (77.75s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/codeengine      86.017s
...

$ make testacc TESTARGS='-run=TestAccIbmCodeEngineAppDataSourceExtended'
...
=== RUN   TestAccIbmCodeEngineAppDataSourceExtended
--- PASS: TestAccIbmCodeEngineAppDataSourceExtended (79.72s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/codeengine      87.443s
...