feat: remove plan validation argument

[rajatagarwal-ibm]

SKIP UPGRADE TEST: existing variable deleted

Description

Remove deprecated "plan_validation" argument.

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Release notes content

plan_validation variable has been removed as the underlying provider does not longer support this input (as of version 1.59). Note that the module already performs some level of validations which would cover some of the removed features from the provider, albeit not a 100% equivalent.

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[rajatagarwal-ibm]

/run pipeline

[terraform-ibm-modules-ops]

🎉 This PR is included in version 1.3.0 🎉

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