feat: update ocp_entitlement default value to null

[Khuzaima05]

Description

updated the ocp_entitlement default value to null

issue: https://github.com/terraform-ibm-modules/terraform-ibm-base-ocp-vpc/issues/446

Release required?

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• [ ] Patch release (x.x.X)
• [ ] Minor release (x.X.x)
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[Khuzaima05]

/run pipeline

[Khuzaima05]

/run pipeline

[Khuzaima05]

upgrade test is failing, so skipping it

[Khuzaima05]

/run pipeline

[terraform-ibm-modules-ops]

:tada: This PR is included in version 3.27.0 :tada:

The release is available on GitHub release

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