refactor: cross-object validation and Terraform Upgrade

[mukulpalit-ibm]

Description

• terraform version upgrade to 1.9.0
• migrated validation from patterns/mixed/config.tf, patterns/vsi/module/config.tf and patterns/vsi-extension/config.tf to variables.tf

Test Cases :

override	override_json_string	ssh_public_key	existing_ssh_key_name	result
false	""	"ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC1examplekey"	null	✅
false	""	null	"my-key-name"	✅
true	""	null	null	✅
false	"{"some": "value"}"	null	null	✅
false	"{"some": "value"}"	"ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC1examplekey"	"my-key-name"	✅
false	""	null	null	❌

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[mukulpalit-ibm]

/run pipeline

[Aashiq-J]

LGTM

[terraform-ibm-modules-ops]

🎉 This PR is included in version 7.5.0 🎉

The release is available on:

• GitHub release
• v7.5.0

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